| from 01/15/2003 to present in LexisNexis Academic (selected full-text only) |
| from 10/01/2001 to present in ProQuest Research Library |
| from 03/01/2002 to 03/01/2005 in ProQuest Research Library |
| from 07/01/2005 to 1 year ago in ProQuest Research Library |
| from 01/01/1997 to 12/31/2001 in LexisNexis Academic (selected full-text only) |
| from 07/01/1999 to 11/30/2002 in Business Source Premier |
| from 11/01/2000 to 11/01/2002 in General OneFile |
| from 02/22/1990 to present in LexisNexis Academic |
| from 12/01/2000 to present in Newspaper Source |
| from 08/31/2008 to present in General OneFile |
| from 11/26/2000 to present in Newspaper Source |
| from 08/31/2008 to present in General OneFile |
| from 01/01/2006 to present in Academic OneFile |
| from 02/24/2000 to present in LexisNexis Academic |
| from 09/01/2000 to present in LexisNexis Academic (selected full-text only) |
| from 04/15/2007 to present in General OneFile |
| from 11/11/2008 to present in General OneFile and LexisNexis Academic |
| from 01/01/1982 to 01/31/1982 in LexisNexis Academic (selected full-text only) |
| from 01/08/2001 to present in LexisNexis Academic |
| from 10/08/2001 to 11/21/2007 in LexisNexis Academic |
| from 05/28/2003 to present in LexisNexis Academic |
| from 10/05/2004 to 10/18/2004 in LexisNexis Academic |
| from 10/05/2004 to 10/18/2004 in LexisNexis Academic |
| from 01/04/2008 to present in LexisNexis Academic |
| from 01/01/2007 to 12/31/2007 in LexisNexis Academic |
| from 01/01/2008 to 12/31/2008 in LexisNexis Academic |
| from 09/01/2005 to 1 year ago in General OneFile |
| from 12/01/2007 to present in Science Reference Center |
| from 03/07/2001 to present in LexisNexis Academic |
| from 04/05/2006 to present in LexisNexis Academic |
| from 04/01/1989 to 03/01/1991 in General OneFile |
| from 10/30/2002 to 11/12/2003 in General OneFile |
| from 06/01/1998 to present in ProQuest Research Library |
| from 01/01/1999 to present in Business Source Premier |
| from 01/01/2002 to present in General OneFile |
| from 01/13/1999 to present in LexisNexis Academic (selected full-text only) |
| from 11/28/2000 to 06/29/2005 in Newspaper Source |
| from 12/25/2006 to present in LexisNexis Academic |
| from 04/01/1996 to 08/01/1997 in LexisNexis Academic (selected full-text only) |
| from 08/26/2004 to 08/26/2004 in LexisNexis Academic |