APA (7th ed.) Citation

Ingalsbe, L. S., & Simonson, B. D. (1990). WordPerfect 5.0: Workbook and reference. Irwin.

Chicago Style (17th ed.) Citation

Ingalsbe, Lon S., and Brent D. Simonson. WordPerfect 5.0: Workbook and Reference. Homewood, Ill: Irwin, 1990.

MLA (9th ed.) Citation

Ingalsbe, Lon S., and Brent D. Simonson. WordPerfect 5.0: Workbook and Reference. Irwin, 1990.