Rujukan Ramphastides

  1. ↑ LL Short, JFM Horne (2002) Family Capitonidae (barbets). in del Hoyo J., Elliott A. & Christie D.A. (2004) Handbook of the Birds of the World. Volume 7. Jamacars to Woodpeckers Lynx Edicions, Barcelona ISBN 84-87334-37-7
  2. ↑ Sibley, Charles Gald & Ahlquist, Jon Edward (1990): Phylogeny and classification of birds. Yale University Press, New Haven, Conn.
  3. ↑ Moyle, R. G. (2004). Phylogenetics of barbets (Aves: Piciformes) based on nuclear and mitochondrial DNA sequence data. Molecular Phylogenetics and Evolution, 30(1), 187-200.
  4. ↑ Simpson, S. F., & Cracraft, J. (1981). The phylogenetic relationships of the Piciformes (Class Aves). The Auk, 481-494.