Rujukan Apodiformes

  • Dyke, Gareth J.; Waterhouse, David M. & Kristoffersen, Anette M. (2004): Three new fossil landbirds from the early Paleogene of Denmark. Bulletin of the Geological Society of Denmark 51: 47–56. PDF fulltext
  • Hyman, Libbie Henrietta (1992). Hyman's Comparative Vertebrate Anatomy. Chicago: University of Chicago Press, page 39. ISBN 0-226-87013-8
  • Mayr, Gerald (2002): Osteological evidence for paraphyly of the avian order Caprimulgiformes (nightjars and allies). Journal für Ornithologie 143: 82–97. PDF fulltext
  • Mayr, Gerald (2003): Phylogeny of early tertiary swifts and hummingbirds (Aves: Apodiformes). Auk 120(1): 145–151. DOI: DOI: 10.1642/0004-8038(2003)120[0145:POETSA]2.0.CO;2 PDF fulltext