Alvarez, H., Barlow, J. C., Bennett, S. E. ‎., Buskirk, W. H., Chipley, R., Keast, A., & Morton, E. S. 1. (1980). Migrant birds in the neotropics: Ecology, behavior, distribution, and conservation : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, October 27-29, 1977. Washington, D.C.: Smithsonian Institution Press.

Alvarez, Humberto, Jon C. Barlow, Sara Elizabeth ‎ Bennett, William H. Buskirk, Robert Chipley, Allen Keast, and Eugene Siller 1940- Morton. Migrant Birds in the Neotropics: Ecology, Behavior, Distribution, and Conservation : A Symposium Held At the Conservation and Research Center, National Zoological Park, Smithsonian Institution, October 27-29, 1977. Washington, D.C.: Smithsonian Institution Press, 1980.

Alvarez, Humberto, et al. Migrant Birds in the Neotropics: Ecology, Behavior, Distribution, and Conservation : A Symposium Held At the Conservation and Research Center, National Zoological Park, Smithsonian Institution, October 27-29, 1977. Washington, D.C.: Smithsonian Institution Press, 1980.