| from 10/12/1999 to present in LexisNexis Academic |
| from 11/11/2002 to present in LexisNexis Academic |
| from 11/11/2002 to present in LexisNexis Academic |
| from 10/01/2001 to present in Computer Database and Expanded Academic ASAP |
| in Pittsburg State University Print Holdings |