APA

Dougherty J. E., Pfaltzgraff R. L., . (1971). Contending theories of international relations. (Third printing.). Philadelphia, etc: J. B. Lippincott Co.

Chicago

Dougherty James Edward, Pfaltzgraff Robert Louis, . 1971. Contending theories of international relations. (Third printing.). Philadelphia, etc: J. B. Lippincott Co.

Harvard

Dougherty J. E., Pfaltzgraff R. L., . (1971). Contending theories of international relations. (Third printing.). Philadelphia, etc: J. B. Lippincott Co.

MLA

Dougherty James Edward, Pfaltzgraff Robert Louis, . Contending theories of international relations. (Third printing.). Philadelphia, etc: J. B. Lippincott Co. 1971.