Davidson, Daniel S. The Possible Source and Antiquity of the Slate Churingas of Western Australia. 97(2) (April). Proceedings of the American Philosophical Society, 1953. Page/Fig./Plate: 194-213 See: pg. 196, Fig. 2c
Davidson, Daniel S. "A Preliminary Consideration of Aboriginal Australian Decorative Art." Memoirs of the American Philosophical Society Vol. IX. (1937). See: pg. 99, Fig. 72c
