Coughlin, C. E., & Griffin, S. (1931). "By the sweat of thy brow": A series of sermons broadcast by Rev. Chas. E. Coughlin from the Shrine of the Little Flower, October, 1930-February, 1931. The Radio league of the Little Flower.

Coughlin, Charles E., and Stephen Griffin. "By the Sweat of Thy Brow": A Series of Sermons Broadcast by Rev. Chas. E. Coughlin from the Shrine of the Little Flower, October, 1930-February, 1931. The Radio league of the Little Flower, 1931.