Mutual aid: a factor of evolution / By P. Kropotkin; with a forew. by H. L. Beales.

MLA

Kropotkin, Pëtr. Mutual Aid: a Factor of Evolution / By P. Kropotkin; with a Forew. by H. L. Beales. Harmondsworth, 1939.

APA

Kropotkin, P. (1939). Mutual aid: a factor of evolution / By P. Kropotkin; with a forew. by H. L. Beales. Harmondsworth.

Chicago

Kropotkin, Pëtr. Mutual Aid: a Factor of Evolution / By P. Kropotkin; with a Forew. by H. L. Beales. Harmondsworth, 1939.