O'Neill, John Patton & Eckelberry, Don R. (1991): A guide to the birds of Trinidad and Tobago (2nd edition). Comstock Publishing, Ithaca, N.Y. Hilty, Steven L. (2003): Birds of Venezuela. Christopher Helm, London. Restall, Robin L.; Rodner, C. & Lentino, M. (2006): Birds of Northern South America. Christopher Helm, London. (vol. 1). (vol. 2). External links Cardinal videos, photos & sounds on the Internet Bird Collection Red-capped cardinal photo gallery VIREO Photo red-capped cardinal Birds of the Amazon Basin Birds of Venezuela Birds of the Guianas red-capped cardinal red-capped cardinal Birds of Brazil