APA-referens (7:e uppl.)

Duffy, M. J., Gasnick, R. M., & Francis, o. A. (1980). Francis, brother of the universe: His complete life's story. Marvel Comics Group : Franciscan Communications Office.

Chicago-referens (17:e uppl.)

Duffy, Mary Jo, Roy M. Gasnick, och of Assisi Francis. Francis, Brother of the Universe: His Complete Life's Story. New York: Marvel Comics Group : Franciscan Communications Office, 1980.

MLA-referens (8:e uppl.)

Duffy, Mary Jo, et al. Francis, Brother of the Universe: His Complete Life's Story. Marvel Comics Group : Franciscan Communications Office, 1980.