APA (7th ed.) Citation

Secretan, L. H. (1989). Workperfect Work Book for IBM Personal Computers. Wordperfect Corporation, 1989.

Chicago Style (17th ed.) Citation

Secretan, Lance H. Workperfect Work Book for IBM Personal Computers. Wordperfect Corporation, 1989, 1989.

MLA (8th ed.) Citation

Secretan, Lance H. Workperfect Work Book for IBM Personal Computers. Wordperfect Corporation, 1989, 1989.

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