Collar, N. J.; Salaman, P. 2013. The taxonomic and conservation status of the Oxypogon helmetcrests. Conservación Colombiana 19: 31-38. Available at: http://www.proaves.org/wp-content/uploads/2013/12/The-taxonomic-and-conservation-status-of-the-Oxypogon-helmetcrests.pdf
del Hoyo, J.; Elliott, A.; Sargatal, J. 1999. Handbook of the Birds of the World, vol. 5: Barn-owls to Hummingbirds. Lynx Edicions, Barcelona, Spain.
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Recommended citation
BirdLife International (2019) Species factsheet: Oxypogon stuebelii. Downloaded from
http://www.birdlife.org on 06/12/2019.
Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 06/12/2019.