APA (7th ed.) Citation

Kulczycki, S., & Knapowski, S. (1961). Non-Euclidean geometry. Pergamon Press.

Chicago Style (17th ed.) Citation

Kulczycki, Stefan, and Stanisław Knapowski. Non-Euclidean Geometry. Pergamon Press, 1961.

MLA (9th ed.) Citation

Kulczycki, Stefan, and Stanisław Knapowski. Non-Euclidean Geometry. Pergamon Press, 1961.

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