.Metzelaar, L. C., .Fox, M. B., & .Metzelaar, L. C. (1991). Hands-on dBase IV. Benjamin/Cummings Pub. Co..
Lua i Stíl Chicago (17ú heag.).Metzelaar, Lawrence C., Marianne B. .Fox, agus Lawrence C. .Metzelaar. Hands-on DBase IV. Redwood City, Calif.: Benjamin/Cummings Pub. Co., 1991.
Lua MLA (9ú heag.).Metzelaar, Lawrence C., et al. Hands-on DBase IV. Benjamin/Cummings Pub. Co., 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.