Campbell, M. (1989). Mary Campbell's dBASE IV handbook. Bantam Books.
Cita Chicago (17th ed.)Campbell, Mary. Mary Campbell's DBASE IV Handbook. Toronto: Bantam Books, 1989.
Cita MLA (9th ed.)Campbell, Mary. Mary Campbell's DBASE IV Handbook. Bantam Books, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.