R. Ridgway. Notes on some Costa Rica Birds. „Proceedings of the United States National Museum”. 4, s. 335, 1881. (ang.).
birdsoftheworld.org
Haplospiza, [w:] The Key to Scientific Names, J.A.J.A.Jobling (red.), [w:] Birds of the World, S.M. Billerman et al. (red.), Cornell Lab of Ornithology, Ithaca [dostęp 2022-01-15](ang.).
Acanthidops, [w:] The Key to Scientific Names, J.A.J.A.Jobling (red.), [w:] Birds of the World, S.M. Billerman et al. (red.), Cornell Lab of Ornithology, Ithaca [dostęp 2022-01-15](ang.).
itis.gov
Haplospiza, [w:] Integrated Taxonomic Information System(ang.).