Mutual aid : : a factor of evolution / / Peter Kropotkine ; introduction: H.L. Beales.

MLA

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

APA

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

Chicago

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