APA (7th ed.) Citation

Harris, R. W. (1990). DOS, WordPerfect & Lotus office companion. Ventana Press.

Chicago Style (17th ed.) Citation

Harris, Robert W. DOS, WordPerfect & Lotus Office Companion. S.l: Ventana Press, 1990.

MLA (9th ed.) Citation

Harris, Robert W. DOS, WordPerfect & Lotus Office Companion. Ventana Press, 1990.

Warning: These citations may not always be 100% accurate.