| from 12/17/1998 to present in General OneFile |
| from 01/04/1999 to present in General Business File ASAP |
| from 2003 to 2003 in Business and Management Practices |
| from 09/01/2005 to present in LexisNexis Academic |
| from 01/01/1984 to 11/01/1991 in General Business File ASAP, General OneFile and General Reference Center Gold |
| from 12/01/2006 to present in Academic OneFile and Health Reference Center Academic |
| from 03/01/2000 to 02/01/2003 in General Business File ASAP, General OneFile and General Reference Center Gold |
| from 04/01/2003 to present in General Business File ASAP, General OneFile and General Reference Center Gold |
| from 01/01/2001 to 14 days ago in General Reference Center Gold |
| from 07/01/2001 to present in Wilson Select Plus |
| from 09/01/2001 to 14 days ago in General Business File ASAP and General OneFile |
| from 01/01/1980 to present in LexisNexis Academic |
| from 01/01/1989 to present in Academic OneFile, General Business File ASAP, General OneFile and General Reference Center Gold |
| from 2001 to 2007 in Business and Management Practices |
| from 06/01/2003 to present in Wilson Select Plus |
| from 01/01/1984 to present in LexisNexis Academic |
| from 1992 to 2007 in Periodical Abstracts |
| from 05/01/2007 to 14 days ago in Academic OneFile, General OneFile and General Reference Center Gold |
| from 11/01/2007 to present in Wilson Select Plus |
| from 02/02/1996 to present in LexisNexis Academic and LexisNexis Academic (selected full-text only) |
| from 06/12/1999 to present in LexisNexis Academic (selected full-text only) |
| from 07/01/2002 to 09/01/2006 in General Business File ASAP, General OneFile and General Reference Center Gold |
| from 08/01/2002 to 09/01/2002 in Wilson Select Plus |
| from 12/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 09/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 01/23/1998 to present in LexisNexis Academic |
| from 11/29/1999 to present in LexisNexis Academic (selected full-text only) |
| from 05/30/1997 to present in LexisNexis Academic (selected full-text only) |
| from 08/01/1998 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 12/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 10/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 07/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 07/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 05/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 10/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 05/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 05/15/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 10/13/1997 to present in LexisNexis Academic (selected full-text only) |
| from 02/01/1998 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1999 to present in LexisNexis Academic (selected full-text only) |
| from 11/07/1999 to present in LexisNexis Academic (selected full-text only) |
| from 05/02/1999 to present in LexisNexis Academic (selected full-text only) |
| from 06/13/1999 to present in LexisNexis Academic (selected full-text only) |
| from 10/24/1999 to present in LexisNexis Academic (selected full-text only) |
| from 06/13/1999 to present in LexisNexis Academic (selected full-text only) |
| from 06/23/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/21/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/21/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/24/1997 to present in LexisNexis Academic (selected full-text only) |
| from 04/25/1998 to present in LexisNexis Academic (selected full-text only) |
| from 05/27/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/21/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/23/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/21/1997 to present in LexisNexis Academic (selected full-text only) |
| from 07/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 01/22/1998 to present in LexisNexis Academic (selected full-text only) |
| from 06/01/1997 to 04/01/1998 in LexisNexis Academic (selected full-text only) |
| from 10/27/1997 to present in LexisNexis Academic (selected full-text only) |
| from 12/01/1997 to present in LexisNexis Academic (selected full-text only) |
| from 02/15/1998 to present in LexisNexis Academic (selected full-text only) |
| from 06/13/1999 to present in LexisNexis Academic (selected full-text only) |
| from 06/13/1999 to present in LexisNexis Academic (selected full-text only) |
| from 06/12/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/09/1997 to present in LexisNexis Academic (selected full-text only) |
| from 06/18/1997 to 04/02/2003 in LexisNexis Academic (selected full-text only) |