APA (7th ed.) Citation

Que Corporation & Davis, S. (1993). Using dBase IV 2.0 (Special ed.). QUE.

Chicago Style (17th ed.) Citation

Que Corporation and Steve Davis. Using DBase IV 2.0. Special ed. Carmel, IN: QUE, 1993.

MLA (8th ed.) Citation

Que Corporation and Steve Davis. Using DBase IV 2.0. Special ed. QUE, 1993.