Ryan, J. A. (1934). The Catholic teaching on our industrial system (2d ed.). National Council of Catholic Men.
Chicago-referens (17:e uppl.)Ryan, John A. The Catholic Teaching on Our Industrial System. 2d ed. Washington: National Council of Catholic Men, 1934.
MLA-referens (8:e uppl.)Ryan, John A. The Catholic Teaching on Our Industrial System. 2d ed. National Council of Catholic Men, 1934.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.