APA

Perkins D., . (19511948). The evolution of American foreign policy. New York: Oxford University Press.

Chicago

Perkins Dexter, . 19511948. The evolution of American foreign policy. New York: Oxford University Press.

Harvard

Perkins D., . (19511948). The evolution of American foreign policy. New York: Oxford University Press.

MLA

Perkins Dexter, . The evolution of American foreign policy. New York: Oxford University Press. 19511948.