APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Levens, A. S., and Henry C. T. Eggers. Descriptive Geometry. New York, London: Harper & brothers, 1941.

MLA (9th ed.) Citation

Levens, A. S., and Henry C. T. Eggers. Descriptive Geometry. Harper & brothers, 1941.