APA (7th ed.) Zitazioa
Roberts, J. (1973). Civilization: Volume II/Journey to the modern world. CRM books.
Chicago Style (17th ed.) Zitazioa
Roberts, John. Civilization: Volume II/Journey to the Modern World. California: CRM books, 1973.
MLA (9th ed.) Zitazioa
Roberts, John. Civilization: Volume II/Journey to the Modern World. CRM books, 1973.
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