APA

Spengler O., Werner H., Helps A. & Atkinson C. F. (1962). The decline of the West. New York: Alfred A. Knopf.

Chicago

Spengler Oswald, Werner Helmut, Helps Arthur and Atkinson Charles Francis. 1962. The decline of the West. New York: Alfred A. Knopf.

Harvard

Spengler O., Werner H., Helps A. and Atkinson C. F. (1962). The decline of the West. New York: Alfred A. Knopf.

MLA

Spengler Oswald, Werner Helmut, Helps Arthur and Atkinson Charles Francis. The decline of the West. New York: Alfred A. Knopf. 1962.