Spence, J. W., & Windsor, J. C. (1987). Microcomputers in business: WordStar, dBase II and III, and Lotus 1-2-3. Times Mirror/Mosby College Pub.
Cita Chicago (17th ed.)Spence, J. Wayne, i John C. Windsor. Microcomputers in Business: WordStar, DBase II and III, and Lotus 1-2-3. St. Louis: Times Mirror/Mosby College Pub, 1987.
Cita MLA (9th ed.)Spence, J. Wayne, i John C. Windsor. Microcomputers in Business: WordStar, DBase II and III, and Lotus 1-2-3. Times Mirror/Mosby College Pub, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.