APA-referens (7:e uppl.)

Barker, J. M. (1919). The social gospel and the new era. Macmillan.

Chicago-referens (17:e uppl.)

Barker, John Marshall. The Social Gospel and the New Era. New York: Macmillan, 1919.

MLA-referens (8:e uppl.)

Barker, John Marshall. The Social Gospel and the New Era. Macmillan, 1919.