APA

Eckhardt C. C., . (1937). The papacy and world affairs. Chicago: The University of Chicago Press.

Chicago

Eckhardt Carl C, . 1937. The papacy and world affairs. Chicago: The University of Chicago Press.

Harvard

Eckhardt C. C., . (1937). The papacy and world affairs. Chicago: The University of Chicago Press.

MLA

Eckhardt Carl C, . The papacy and world affairs. Chicago: The University of Chicago Press. 1937.