APA (7th ed.) Citation

Duffy, T. (1992). Essential dBase IV (version 1.1). Wadsworth.

Chicago Style (17th ed.) Citation

Duffy, Tim. Essential DBase IV (version 1.1). Belmont, Calif: Wadsworth, 1992.

MLA (9th ed.) Citation

Duffy, Tim. Essential DBase IV (version 1.1). Wadsworth, 1992.

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