"Iguaçu Falls." The Columbia Electronic Encyclopedia, Sixth Edition. Columbia University Press. , 2011. Answers.com 12 Nov. 2011. http://www.answers.com/topic/iguaz-falls
"Iguana Falls." Framer's 500 Places to Take Your Kids Before They Grow Up. Wiley Publishing, Inc. , 2009. Answers.com 12 Nov. 2011. http://www.answers.com/topic/iguaz-falls