APA (7th ed.) Citation

Levens, A. S., & Eggers, H. C. T. (1941). Descriptive geometry. Harper.

Chicago Style (17th ed.) Citation

Levens, A. S., and H. C. T. Eggers. Descriptive Geometry. New York: Harper, 1941.

MLA (9th ed.) Citation

Levens, A. S., and H. C. T. Eggers. Descriptive Geometry. Harper, 1941.