APA (7th ed.) Citation

Simpson, A. (1989). Understanding dBase IV. Tech Publ..

Chicago Style (17th ed.) Citation

Simpson, Alan. Understanding DBase IV. Singapore: Tech Publ., 1989.

MLA (9th ed.) Citation

Simpson, Alan. Understanding DBase IV. Tech Publ., 1989.

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