APA (7th ed.) Citation

Simpson, A. (1989). Understanding dBase IV (Special ed.). SYBEX.

Chicago Style (17th ed.) Citation

Simpson, Alan. Understanding DBase IV. Special ed. San Francisco: SYBEX, 1989.

MLA (9th ed.) Citation

Simpson, Alan. Understanding DBase IV. Special ed. SYBEX, 1989.

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