Cita APA (7th ed.)
Simpson, A. (1989). Understanding dBase IV (Special ed.). SYBEX.
Cita Chicago (17th ed.)
Simpson, Alan. Understanding DBase IV. Special ed. San Francisco: SYBEX, 1989.
Cita MLA (9th ed.)
Simpson, Alan. Understanding DBase IV. Special ed. SYBEX, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.