APA (7th ed.) Citation

PC Learning Labs. (1992). Teaches WordPerfect 5.1: Logical operations. Ziff-Davis Press.

Chicago Style (17th ed.) Citation

PC Learning Labs. Teaches WordPerfect 5.1: Logical Operations. Emeryville, Calif: Ziff-Davis Press, 1992.

MLA (9th ed.) Citation

PC Learning Labs. Teaches WordPerfect 5.1: Logical Operations. Ziff-Davis Press, 1992.

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