APA (7th ed.) Citation

Bergmann, P. G. (1968). The riddle of gravitation. Scribner.

Chicago Style (17th ed.) Citation

Bergmann, Peter Gabriel. The Riddle of Gravitation. New York: Scribner, 1968.

MLA (9th ed.) Citation

Bergmann, Peter Gabriel. The Riddle of Gravitation. Scribner, 1968.

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