Template:Watson, 1919
- Watson, D.M.S. 1919. The structure, evolution and origin of the Amphibia.—The "orders" Rachitomi and Stereospondyli. Philosophical Transactions of the Royal Society of London, Series B 209: 1–73. DOI: 10.1098/rstb.1920.0001
. ARK: 13960/t3gx57k8j . JSTOR 
