APA (7th ed.) Citation

Bergmann, P. G. (1969). The riddle of gravitation (1. publ.). Murray.

Chicago Style (17th ed.) Citation

Bergmann, Peter Gabriel. The Riddle of Gravitation. 1. publ. London: Murray, 1969.

MLA (9th ed.) Citation

Bergmann, Peter Gabriel. The Riddle of Gravitation. 1. publ. Murray, 1969.

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