Krumm, R. (1989). Understanding and using dBase IV. Brady.
Lua i Stíl Chicago (17ú heag.)Krumm, Rob. Understanding and Using DBase IV. New York: Brady, 1989.
Lua MLA (9ú heag.)Krumm, Rob. Understanding and Using DBase IV. Brady, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.