Literature
  • Brom 1991b
  • Variability and phylogenetic significance of detachable nodes in feathers of galliforms, tinamous, and turacos. J. Zool., Lond. 225: 589-604.
  • Brom 1990
  • Villi and te phyly of Wetmore's order Piciformes (Aves). Zoological Journal of the Linnean Society 98: 63-72.