Aldemaro Romero (4 February 2009). "Cave Biology"(PDF). Cambridge University Press. Retrieved 30 March 2013.
Aldemaro Romero; A. Ignacio Agudo; Steven M. Green (1997). "Exploitation of Cetaceans in Venezuela"(PDF). Rep. Int. Whal. Comm. 47: 735–746. Retrieved 30 March 2013.