Cita APA (7th ed.)

Philip, C. (1989). dBase IV: Developer's reference guide. Management Information Source, Inc.

Cita Chicago (17th ed.)

Philip, Cliff. DBase IV: Developer's Reference Guide. Portland, Or: Management Information Source, Inc, 1989.

Cita MLA (9th ed.)

Philip, Cliff. DBase IV: Developer's Reference Guide. Management Information Source, Inc, 1989.