APA (7th ed.) Citation

Kropotkin, P., & Beales, H. (1939). Mutual aid: A factor of evolution. Harmondsworth: Penguin Books.

Chicago Style (17th ed.) Citation

Kropotkin, Peter, and H.L Beales. Mutual Aid: A Factor of Evolution. Harmondsworth: Penguin Books, 1939.

MLA (8th ed.) Citation

Kropotkin, Peter, and H.L Beales. Mutual Aid: A Factor of Evolution. Harmondsworth: Penguin Books, 1939.

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