1. The Keystone Triad;Ricketts;Am. J. Orthodontics,1964
2. The Growth of the Jaws and Palate;Brash,1924
3. A Contribution to the Mechanism of Growth of the Human Face;Keith;D. Record,1922
4. On the Growth of the Jaws;Humphrey;Tr. Cambridge Phil. Soc.,1866
5. The Natural History of Human Teeth;Hunter,1803