APA (7th ed.) Citation

Level, D. A., & Galle, W. P. (1980). Business communications: Theory and practice. Business Pub.

Chicago Style (17th ed.) Citation

Level, Dale A., and William P. Galle. Business Communications: Theory and Practice. Dallas, TX: Business Pub, 1980.

MLA (9th ed.) Citation

Level, Dale A., and William P. Galle. Business Communications: Theory and Practice. Business Pub, 1980.