APA (7th ed.) Citation

Davis, M., Gray, G. M., & Hallez, H. (1990). Manuals that work: A guide for writers. GP Pub..

Chicago Style (17th ed.) Citation

Davis, Michael, Gary M. Gray, and Harry Hallez. Manuals That Work: A Guide for Writers. Columbia, Md.: GP Pub., 1990.

MLA (9th ed.) Citation

Davis, Michael, et al. Manuals That Work: A Guide for Writers. GP Pub., 1990.