APA (7th ed.) Zitazioa
Wills, F. R. (1982). World Civilizations: From ancient times through the sixteenth century. D.C. Hearth and Company.
Chicago Style (17th ed.) Zitazioa
Wills, F. Roy. World Civilizations: From Ancient Times Through the Sixteenth Century. Lexington, Massachusetts: D.C. Hearth and Company, 1982.
MLA (9th ed.) Zitazioa
Wills, F. Roy. World Civilizations: From Ancient Times Through the Sixteenth Century. D.C. Hearth and Company, 1982.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.