APA

Brief G. A., . (1937). The proletariat; a challenge to western civilization. New York: McGraw-Hill.

Chicago

Brief Goetz A, . 1937. The proletariat; a challenge to western civilization. New York: McGraw-Hill.

Harvard

Brief G. A., . (1937). The proletariat; a challenge to western civilization. New York: McGraw-Hill.

MLA

Brief Goetz A, . The proletariat; a challenge to western civilization. New York: McGraw-Hill. 1937.