BirdLife International (2004). Podiceps nigricollis. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 9 May 2006. Database entry includes justification for why this species is of least concern
Herrera, Néstor; Rivera, Roberto; Ibarra Portillo, Ricardo & Rodríguez, Wilfredo (2006) : Nuevos registros para la avifauna de El Salvador. ["New records for the avifauna of El Salvador"]. Boletín de la Sociedad Antioqueña de Ornitología 16 (2) : 1–19. [Spanish with English abstract] PDF fulltext
Ogilvie, Malcolm (2003). Grebes of the World. Uxbridge, UK: Bruce Coleman. ISBN1-872842-03-8. Unknown parameter |coauthors= ignored (|author= suggested) (help)
Joournal Article: Optimizing Migration in a reluctant and inefficient flier: The eared grebe
