Greenberg, R. 1., Leach, L., Grousillat, J., Kraut, E., & Zickefoose, J. (1993). Uniendo las Américas: Aves migratorias en Costa Rica y Panamá = Bridging the Americas : migratory birds in Costa Rica & Panama. Washington, D.C., USA: Smithsonian Migratory Bird Center, National Zoological Park.

Greenberg, Russell 1953-2013, Lucinda Leach, Jacqueline Grousillat, Elena Kraut, and Julie Zickefoose. Uniendo Las Américas: Aves Migratorias En Costa Rica Y Panamá = Bridging the Americas : Migratory Birds in Costa Rica & Panama. Washington, D.C., USA: Smithsonian Migratory Bird Center, National Zoological Park, 1993.

Greenberg, Russell 1953-2013, et al. Uniendo Las Américas: Aves Migratorias En Costa Rica Y Panamá = Bridging the Americas : Migratory Birds in Costa Rica & Panama. Washington, D.C., USA: Smithsonian Migratory Bird Center, National Zoological Park, 1993.