APA (7th ed.) Citation

SIMPSON, A. (1989). Understanding dBASE IV - Alan Simpson. Tech Publications.

Chicago Style (17th ed.) Citation

SIMPSON, Alan. Understanding DBASE IV - Alan Simpson. Tech Publications, 1989.

MLA (8th ed.) Citation

SIMPSON, Alan. Understanding DBASE IV - Alan Simpson. Tech Publications, 1989.

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