Cita APA (7th ed.)
Quigley, C. (1979). The evolution of civilizations: An introduction to historical analysis (Segunda edición.). Liberty Press.
Cita Chicago (17th ed.)
Quigley, Carroll. The Evolution of Civilizations: An Introduction to Historical Analysis. Segunda edición. Indianapolis: Liberty Press, 1979.
Cita MLA (9th ed.)
Quigley, Carroll. The Evolution of Civilizations: An Introduction to Historical Analysis. Segunda edición. Liberty Press, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.