APA (7th ed.) Citation

Usiskin, Z., Griffin, J., Witonsky, D., & Willmore, E. (2008). The classification of quadrilaterals: A study of definition. Information Age Pub..

Chicago Style (17th ed.) Citation

Usiskin, Zalman, Jennifer Griffin, David Witonsky, and Edwin Willmore. The Classification of Quadrilaterals: A Study of Definition. Charlotte, NC: Information Age Pub., 2008.

MLA (9th ed.) Citation

Usiskin, Zalman, et al. The Classification of Quadrilaterals: A Study of Definition. Information Age Pub., 2008.