Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.

APA Citation Edition Citation

Cowgill, G. L., & Yoffee, N. (1991). The collapse of ancient states and civilizations (2nd printing.). The University of Arizona Press.

Chicago Citation Edition Citation

Cowgill, George L., und Norman Yoffee. The Collapse of Ancient States and Civilizations. 2nd printing. Tucson: The University of Arizona Press, 1991.

MLA Citation Edition Citation

Cowgill, George L., und Norman Yoffee. The Collapse of Ancient States and Civilizations. 2nd printing. The University of Arizona Press, 1991.