APA

Pierson W. W., Gil F. G., . (1957). Governments of Latin America. New York: McGraw-Hill.

Chicago

Pierson William Whatley, Gil Federico Guillermo, . 1957. Governments of Latin America. New York: McGraw-Hill.

Harvard

Pierson W. W., Gil F. G., . (1957). Governments of Latin America. New York: McGraw-Hill.

MLA

Pierson William Whatley, Gil Federico Guillermo, . Governments of Latin America. New York: McGraw-Hill. 1957.