Shelly, G. B., Cashman, T. J., & Waggoner, G. (1990). Computer concepts with microcomputer applications: WordPerfect 5.0/5.1, Lotus 1-2-3, dBASE III Plus. Boye & Fraser Pub. Co..
Cita Chicago (17th ed.)Shelly, Gary B., Thomas J. Cashman, i Gloria Waggoner. Computer Concepts with Microcomputer Applications: WordPerfect 5.0/5.1, Lotus 1-2-3, DBASE III Plus. Boston, MA: Boye & Fraser Pub. Co., 1990.
Cita MLA (8th ed.)Shelly, Gary B., et al. Computer Concepts with Microcomputer Applications: WordPerfect 5.0/5.1, Lotus 1-2-3, DBASE III Plus. Boye & Fraser Pub. Co., 1990.
Atenció: Aquestes cites poden no estar 100% correctes.