Cita APA (7th ed.)
Willis, F. R. (1977). Western civilization: An urban perspective (2nd.ed.). D.C.Heath and Co..
Cita Chicago (17th ed.)
Willis, F. Roy. Western Civilization: An Urban Perspective. 2nd.ed. Lexington Massachusetts: D.C.Heath and Co., 1977.
Cita MLA (9th ed.)
Willis, F. Roy. Western Civilization: An Urban Perspective. 2nd.ed. D.C.Heath and Co., 1977.
Atenció: Aquestes cites poden no estar 100% correctes.