APA

Russell B., . (1993). Our knowledge of the external world. New York: The New American Library.

Chicago

Russell Bertrand, . 1993. Our knowledge of the external world. New York: The New American Library.

Harvard

Russell B., . (1993). Our knowledge of the external world. New York: The New American Library.

MLA

Russell Bertrand, . Our knowledge of the external world. New York: The New American Library. 1993.