APA (7th ed.) Citation

Willoughby, T. C., & Senn, J. (1975). Business systems. Association for Systems Management.

Chicago Style (17th ed.) Citation

Willoughby, Theodore C., and James Senn. Business Systems. Cleveland, Ohio: Association for Systems Management, 1975.

MLA (9th ed.) Citation

Willoughby, Theodore C., and James Senn. Business Systems. Association for Systems Management, 1975.

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