Cita APA (7th ed.)

Simpson, A. (1987). dBase III plus: Programmer's reference guide. Sybex.

Cita Chicago (17th ed.)

Simpson, Alan. DBase III Plus: Programmer's Reference Guide. San Francisco: Sybex, 1987.

Cita MLA (8th ed.)

Simpson, Alan. DBase III Plus: Programmer's Reference Guide. Sybex, 1987.