Chou, G. T. (1988). dBase IV handbook (3rd edition.). Perfect Bound Publishing.
Lua i Stíl Chicago (17ú heag.)Chou, George Tsu-der. DBase IV Handbook. 3rd edition. Quezon City: Perfect Bound Publishing, 1988.
Lua MLA (9ú heag.)Chou, George Tsu-der. DBase IV Handbook. 3rd edition. Perfect Bound Publishing, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.