APA (7e ed.) Bronvermelding

Levi, H. (1960). Foundations of geometry and trignometry. Prentice Hall.

Chicago (17e ed.) Bronvermelding

Levi, Howard. Foundations of Geometry and Trignometry. Englewood Cliffs: Prentice Hall, 1960.

MLA (9e ed.) Bronvermelding

Levi, Howard. Foundations of Geometry and Trignometry. Prentice Hall, 1960.