APA (7th ed.) Citation

SIMPSON. (1990). Understanding dBase IV 1.1 (2nd edition.). Tech Publ.

Chicago Style (17th ed.) Citation

SIMPSON. Understanding DBase IV 1.1. 2nd edition. Singapore: Tech Publ, 1990.

MLA (8th ed.) Citation

SIMPSON. Understanding DBase IV 1.1. 2nd edition. Tech Publ, 1990.

Warning: These citations may not always be 100% accurate.