Mutual aid, a factor of evolution

MLA

Kropotkin, Petr Alekseevič, Thomas Henry Huxley, and Ashley Montagu. Mutual Aid, a Factor of Evolution. Boston, Mass.: Extending Horizon Books, 1955.

APA

Kropotkin, P. Alekseevič, Huxley, T. Henry, & Montagu, A. (1955). Mutual aid, a factor of evolution. Boston, Mass.: Extending Horizon Books.

Chicago

Kropotkin, Petr Alekseevič, Thomas Henry Huxley, and Ashley Montagu. Mutual Aid, a Factor of Evolution. Boston, Mass.: Extending Horizon Books, 1955.