APA

Hacker L. M., Zahler H. S., . (1947). The shaping of the American tradition. New York: Columbia university press.

Chicago

Hacker Louis M, Zahler Helene Sara, . 1947. The shaping of the American tradition. New York: Columbia university press.

Harvard

Hacker L. M., Zahler H. S., . (1947). The shaping of the American tradition. New York: Columbia university press.

MLA

Hacker Louis M, Zahler Helene Sara, . The shaping of the American tradition. New York: Columbia university press. 1947.