1 2 3 4 5 George M. Eberhart, Mysterious Creatures: A Guide to Cryptozoology .,Abc-Clio Inc. , 2002,ISBN 9781576072837 , p.220
1 2 3 4 5 6 7 Michael Newton. Encyclopedia Of Cryptozoology: A Global Guide To Hidden Animals And Their Pursuers , McFarland Publishing, 2005, ISBN 978-0786420360 pp.187-186