APA (7th ed.) Citation

Coolidge, J. L. (1909). The elements of non-euclidean geometry. Clarendon Press.

Chicago Style (17th ed.) Citation

Coolidge, Julian Lowell. The Elements of Non-euclidean Geometry. Oxford: Clarendon Press, 1909.

MLA (9th ed.) Citation

Coolidge, Julian Lowell. The Elements of Non-euclidean Geometry. Clarendon Press, 1909.