http://www.cryptoarchives.com/1900/1980/1981-regusters.pdf* Shuker, Karl P.N., "In Search of Prehistoric Survivors.
http://web.archive.org/web/20110708205942/http://www.cryptoarchives.com/1900/1980/1981-regusters.pdf* Shuker, Karl P.N., "In Search of Prehistoric Survivors.