Foster, Mercedes S. 1985. "Pre-nesting cooperation in birds: another form of helping behavior." In Neotropical Ornithology. Buckley, Paul A., Foster, Mercedes S., Morton, Eugene S., Ridgely, Robert S., and Buckley, Frances G., editors. 817–828. Washington DC: American Ornithologists Union. In Ornithological Monographs, no. 36.
Banks, Richard C., Chesser, R. Terry, Cicero, Carla, Dunn, Jon L., Kratter, Andrew W., Lovette, Rby J., Rasmussen, Pamela C., Remsen, J. V., Jr., Rising, James D., and Stotz, Douglas F. 2007. "Forty-eighth supplement to the American ornithologists' union Check-List of North American Birds." The Auk, 124, (3) 1109–1115. https://doi.org/10.1642/0004-8038(2007)124[1109:FSTTAO]2.0.CO;2.
Banks, Richard C., Cicero, Carla, Dunn, Jon L., Kratter, Andrew W., Rasmussen, Pamela C., Remsen, J. V., Jr., Rising, James D., and Stotz, Douglas F. 2006. "Forty-seventh supplement to the American Ornithologists' Union Check-list of North American birds." The Auk, 123, (3) 926–936. https://doi.org/10.1642/0004-8038(2006)123[926:FSTTAO]2.0.CO;2.