Treherne, John (1983) The Galapagos Affair. Random House, NY, USA.
Beebe, William (1924) Galapagos: World’s End. G. P. Putnam’s Sons, NY, USA.
Strauch, Dore (1936) Satan Came to Eden: A Survivor‘s Account of the “Galapagos Affair“. Harper & Bros, London, UK.
The San Fransisco Examiner (1930) Two Modern Robinson Crusoes. Sun 06 April, 1930. P103. CA, USA.
The Montreal Star (1932) Hunt For Priates Hoard. 29 December, 1932. Quebec, Canada.
The Miami News (1934) Ritter, Galapagos Nudist, Dies Without Telling Orgy secrets. 06 December 1934, P.21. FL, USA.