APA aipamena

Kropotkin, P. (1924). Ethics: Origin and development. London: Harrap & Co.

Chicago Style aipamena

Kropotkin, Peter. Ethics: Origin and Development. London: Harrap & Co, 1924.

MLA aipamena

Kropotkin, Peter. Ethics: Origin and Development. London: Harrap & Co, 1924.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.