Lua APA (7ú heag.)
Winegarden, C., & Delay, E. (2001). Visual FoxPro certification exams study guide. Hentzenwerke Publishing.
Lua i Stíl Chicago (17ú heag.)
Winegarden, Cindy, agus Evan Delay. Visual FoxPro Certification Exams Study Guide. Whitefish Bay, Wis.: Hentzenwerke Publishing, 2001.
Lua MLA (9ú heag.)
Winegarden, Cindy, agus Evan Delay. Visual FoxPro Certification Exams Study Guide. Hentzenwerke Publishing, 2001.
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