Cita APA (7a ed.)

Yoffee, N., & Cowgill, G. L. (1995). The collapse of ancient states and civilizations. University of Arizona Press.

Cita Chicago Style (17a ed.)

Yoffee, Norman, y George L. Cowgill. The Collapse of Ancient States and Civilizations. Tucson: University of Arizona Press, 1995.

Cita MLA (9a ed.)

Yoffee, Norman, y George L. Cowgill. The Collapse of Ancient States and Civilizations. University of Arizona Press, 1995.