Toynbee, A. J. Introduction. The genesis of civilizations (2a ed.).
Chicago Style aipamenaToynbee, Arnold J. Introduction. The Genesis of Civilizations. 2a ed.
MLA aipamenaToynbee, Arnold J. Introduction. The Genesis of Civilizations. 2a ed.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.