Buckland, William (1822). "Account of an assemblage of fossil teeth and bones of elephants, rhinoceros, hippopotamus, bear, tiger, and hyaena, and sixteen other animals, discovered in a cave at Kirkdale, Yorkshire, in the year 1821: with a comparative view of five similar caverns in various parts of England, and others on the Continent". Philosophical Transactions of the Royal Society. 112: 171–236. JSTOR107680.