APA (7th ed.) Citation

Godfrey, C. M., & Siddons, A. W. (1928). Modern geometry. University Press.

Chicago Style (17th ed.) Citation

Godfrey, Charles M., and A. W. Siddons. Modern Geometry. Cambridge: University Press, 1928.

MLA (9th ed.) Citation

Godfrey, Charles M., and A. W. Siddons. Modern Geometry. University Press, 1928.