APA

Baldwin M. W., . (1940). The medieval papacy in action. New York: The Macmillan company.

Chicago

Baldwin Marshall W, . 1940. The medieval papacy in action. New York: The Macmillan company.

Harvard

Baldwin M. W., . (1940). The medieval papacy in action. New York: The Macmillan company.

MLA

Baldwin Marshall W, . The medieval papacy in action. New York: The Macmillan company. 1940.