APA (7th ed.) Citation

Hursch, J. L., & Hursch, C. J. (1989). dBASE IV SQL user's guide. Ashton-Tate.

Chicago Style (17th ed.) Citation

Hursch, Jack L., and Carolyn J. Hursch. DBASE IV SQL User's Guide. Torrance, Calif: Ashton-Tate, 1989.

MLA (9th ed.) Citation

Hursch, Jack L., and Carolyn J. Hursch. DBASE IV SQL User's Guide. Ashton-Tate, 1989.