APA

Hagen V.W, . (1961). Realm of the Incas. New York; Scarborough, Ontario; London: A Mentor Book.

Chicago

Hagen V.W, . 1961. Realm of the Incas. New York; Scarborough, Ontario; London: A Mentor Book.

Harvard

Hagen V.W, . (1961). Realm of the Incas. New York; Scarborough, Ontario; London: A Mentor Book.

MLA

Hagen V.W, . Realm of the Incas. New York; Scarborough, Ontario; London: A Mentor Book. 1961.