APA (7th ed.) Citation

Engl, L., & Engl, T. (1969). Twilight of ancient Peru: The glory and decline of the Inca empire. McGraw-Hill.

Chicago Style (17th ed.) Citation

Engl, Lieselotte, and Theo Engl. Twilight of Ancient Peru: The Glory and Decline of the Inca Empire. New York: McGraw-Hill, 1969.

MLA (9th ed.) Citation

Engl, Lieselotte, and Theo Engl. Twilight of Ancient Peru: The Glory and Decline of the Inca Empire. McGraw-Hill, 1969.