| from 01/01/2003 to present in Business Source Premier |
| from 09/01/2000 to present in Business Source Premier |
| from 10/01/1998 to present in Business Source Premier |
| from 12/16/2004 to present in LexisNexis Academic |
| from 11/01/2001 to 06/01/2002 in Academic OneFile and General OneFile |
| from 01/01/1996 to 1 year ago in HighWire Press (Free Journals) |
| from 01/01/1999 to 1 year ago in ProQuest Research Library |
| from 2008 to 1 year ago in PubMed Central |
| from 10/30/1997 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1989 to 06/20/1997 in LexisNexis Academic (selected full-text only) |
| from 04/01/1994 to present in LexisNexis Academic |
| from 01/01/1997 to present in ProQuest Research Library |
| from 10/01/1997 to 01/01/2009 in Academic OneFile, General OneFile and Literature Resource Center |
| from 03/01/1999 to 1 year ago in Academic Search Premier |
| from 09/01/2000 to 3 months ago in Academic Search Premier |
| from 01/02/2004 to present in LexisNexis Academic |
| from 11/01/2004 to present in MasterFILE Premier |
| from 02/01/2005 to present in General OneFile |
| from 03/01/1997 to 12/01/1998 in Academic OneFile and General OneFile |
| from 01/01/1998 to 1 year ago in ABI/INFORM Global |
| from 06/01/2003 to present in Academic OneFile |
| from 01/01/2005 to 1 year ago in ABI/INFORM Global |
| from 01/01/2006 to 1 year ago in ABI/INFORM Global |
| from 04/01/2004 to 10/01/2006 in ProQuest Research Library |
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| from 05/01/1978 to 1 year ago in Academic Search Premier and Business Source Premier |
| from 01/01/2002 to present in Academic OneFile |
| from 12/01/1987 to present in ABI/INFORM Global |
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| from 2002 to 3 years ago in PubMed Central |
| from 03/01/2002 to 12/31/2005 in HighWire Press (Free Journals) |
| from 03/01/2002 to 02/01/2004 in Academic OneFile and General OneFile |
| from 01/01/1998 to 04/30/2004 in Business Source Premier |
| from 01/01/1995 to 1 year ago in ProQuest Research Library |
| from 09/01/2001 to 1 year ago in Business Source Premier |
| from 01/01/2007 to 12/01/2008 in Academic OneFile |
| from 12/01/2003 to 12/01/2008 in ProQuest Research Library |
| from 1992 to 12/31/2001 in PubMed Central |
| from 03/01/1992 to 12/31/2001 in HighWire Press (Free Journals) |
| from 03/01/2001 to 03/01/2002 in Academic OneFile and General OneFile |
| from 04/01/1999 to 18 months ago in Academic Search Premier and Professional Development Collection |
| from 05/01/1999 to 09/01/2001 in Academic OneFile and General OneFile |
| from 03/01/2003 to 6 months ago in Academic Search Premier |
| from 01/01/2002 to present in ABI/INFORM Global |
| from 02/01/1997 to 1 year ago in Academic Search Premier |
| from 07/01/1994 to present in ABI/INFORM Global and ProQuest Research Library |
| from 03/01/2003 to 1 year ago in ABI/INFORM Global |
| from 03/08/2004 to 06/08/2006 in LexisNexis Academic (selected full-text only) |
| from 01/01/1998 to 07/01/2001 in ProQuest Research Library |
| from 03/01/1987 to 09/01/1998 in LexisNexis Academic (selected full-text only) |
| from 09/01/1999 to present in Academic Search Premier, MasterFILE Premier and Professional Development Collection |
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| from 01/16/1990 to 01/31/2002 in Academic Search Premier and MasterFILE Premier |
| from 10/01/2004 to present in ABI/INFORM Global |
| from 12/01/2006 to present in Academic OneFile |
| from 03/01/1999 to present in Business Source Premier |
| from 09/01/1983 to 09/30/2007 in Business Source Premier |
| from 01/01/1984 to 09/30/2007 in MasterFILE Premier |
| from 01/01/1989 to 09/22/2007 in Academic OneFile and General OneFile |
| from 10/01/1886 to 1 year ago in Business Source Premier |
| from 08/01/1993 to 05/01/2001 in Academic OneFile and General OneFile |
| from 02/05/2002 to present in LexisNexis Academic |
| from 03/01/2002 to 12/31/2002 in Business Source Premier |
| from 01/01/1908 to 02/28/1938 in HighWire Press (Free Journals) |
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| from 01/01/2008 to present in Academic OneFile, Business Source Premier, General OneFile and MasterFILE Premier |
| from 03/01/1999 to 1 year ago in ProQuest Research Library |
| from 01/01/1999 to 1 year ago in ProQuest Research Library |
| from 01/01/1853 to 12/31/1965 in HighWire Press (Free Journals) |
| from 01/01/2006 to 11/01/2007 in Academic OneFile |
| from 08/01/2002 to 11/30/2004 in Business Source Premier |
| from 07/01/2002 to 07/31/2005 in Business Source Premier |
| from 02/01/1952 to present in LexisNexis Academic |
| from 07/01/1987 to 07/01/2003 in ABI/INFORM Global and ProQuest Research Library |
| from 01/01/1990 to present in Academic Search Premier, Business Source Premier and MasterFILE Premier |
| from 09/22/1994 to present in Academic OneFile and General OneFile |
| from 01/01/1987 to 07/01/1994 in ABI/INFORM Global and ProQuest Research Library |
| from 01/01/1989 to 06/22/1994 in Academic OneFile and General OneFile |
| from 03/01/1990 to 06/30/1994 in Academic Search Premier, Business Source Premier and MasterFILE Premier |
| from 1926 to 2003 in JSTOR Ecology & Botany Collection |
| from 09/01/1999 to 1 year ago in Academic Search Premier |
| from 01/01/1933 to 12/31/1947 in ABI/INFORM Global |
| from 01/01/1949 to 04/01/1950 in ABI/INFORM Global |
| from 03/01/2002 to present in Academic Search Premier and Professional Development Collection |
| from 07/01/1998 to 07/01/2000 in ProQuest Research Library |
| from 03/22/1989 to 12/22/1991 in Academic OneFile and General OneFile |
| from 06/22/1992 to 09/22/1998 in Academic OneFile and General OneFile |
| from 01/01/1995 to present in ScienceDirect Social & Behavioral Sciences College Edition |
| from 09/01/1996 to 12/15/2001 in Business Source Premier and MasterFILE Premier |
| from 03/01/2003 to 03/31/2007 in Business Source Premier |
| from 03/01/2003 to 03/01/2006 in General OneFile |
| from 02/01/2006 to present in ScienceDirect Physical Sciences College Edition |
| from 01/01/1995 to present in ScienceDirect Physical Sciences College Edition |
| from 01/01/1995 to present in ScienceDirect Physical Sciences College Edition |
| from 01/01/1995 to present in ScienceDirect Physical Sciences College Edition |
| from 01/01/2006 to present in Newspaper Source |
| from 09/22/2000 to present in Academic OneFile and General OneFile |
| from 09/01/1995 to present in LexisNexis Academic |
| from 03/01/1987 to present in LexisNexis Academic (selected full-text only) |
| from 03/01/1996 to present in Literature Resource Center |
| from 03/22/1996 to present in Academic OneFile and General OneFile |
| from 08/01/2007 to present in Academic OneFile |
| from 03/01/2005 to present in Academic OneFile |
| from 08/10/2009 to present in LexisNexis Academic |
| from 09/16/2001 to present in LexisNexis Academic |
| from 03/22/2001 to present in Academic OneFile |
| from 02/04/1998 to 06/01/1998 in Newspaper Source |
| from 01/01/1999 to 1 year ago in ABI/INFORM Global and ProQuest Research Library |
| from 01/15/2008 to 06/24/2008 in Academic OneFile |
| from 01/01/1983 to 10/01/1985 in General OneFile |
| from 01/01/1989 to present in General OneFile |
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| from 07/01/1999 to 12/31/2001 in Business Source Premier |
| from 01/01/2000 to 12/01/2001 in General OneFile |
| from 11/01/2000 to 12/01/2001 in LexisNexis Academic |
| from 12/01/2004 to present in General OneFile |
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| from 01/01/1989 to present in Academic OneFile and General OneFile |
| from 07/01/1993 to present in Literary Reference Center |
| from 09/01/1997 to present in ABI/INFORM Global and ProQuest Research Library |
| from 12/22/1999 to present in LexisNexis Academic |
| from 10/28/1997 to 07/11/2001 in LexisNexis Academic |
| from 01/01/2008 to present in Academic OneFile |
| from 01/31/1996 to present in LexisNexis Academic |
| from 08/01/2007 to present in LexisNexis Academic |