APA

Smith G. D., . (1928). An outline of Catholic teaching. New York: The Macmillan Company.

Chicago

Smith George Duncan, . 1928. An outline of Catholic teaching. New York: The Macmillan Company.

Harvard

Smith G. D., . (1928). An outline of Catholic teaching. New York: The Macmillan Company.

MLA

Smith George Duncan, . An outline of Catholic teaching. New York: The Macmillan Company. 1928.