APA (7th ed.) Citation

Ringenberg, L. A. (1967). Informal geometry. Wiley.

Chicago Style (17th ed.) Citation

Ringenberg, Lawrence A. Informal Geometry. New York: Wiley, 1967.

MLA (9th ed.) Citation

Ringenberg, Lawrence A. Informal Geometry. Wiley, 1967.

Warning: These citations may not always be 100% accurate.