References

Buchsbaum, R., Buchsbaum, M., Pearse, J. and Pearse, V. 1987. Animals Without Backbones, 3rd ed. University of Chicago Press, Chicago.

Chong, Mike H. N. "Observations on the Breeding Biology of Helmeted Hornbill in Pahan, Peninsular Malaysia." The Raffles Bulletin of Zoology 24 (2011): 163-165. Web.

George A. Gale and Siriporn Thongaree (2006). Density estimates of nine hornbill species in a lowland forest site in southern Thailand. Bird Conservation International, 16, pp 57-69.

Greij, Eldon. "Hornbills." Birder's World 24.5 (2010): 46-47. Academic Search Complete. Web. 25 Apr. 2014.

Hoyo, Josep Del., Andrew Elliott, and Jordi Sargatal. Handbook of the Birds of the World. Barcelona: Lynx Edicions, 2001. Print.

Kinnaird, M., and Timothy G. O'Brien. The Ecology & Conservation of Asian Hornbills: Farmers of the Forest. Chicago: U of Chicago, 2007. Print.

Kinnaird, M. F., Hadiprakarsa, Y.-Y. and Thiensongrusamee, P. (2003), Aerial jousting by Helmeted Hornbills Rhinoplax vigil: observations from Indonesia and Thailand. Ibis, 145: 506–508.

Kemp, A. C. The Hornbills: Bucerotiformes. Oxford: Oxford UP, 1995. 3-200. Print.

Margulis, Lynn, and Karlene V. Schwartz. Five Kingdoms: An Illustrated Guide to the Phyla of Life on Earth. New York: W.H. Freeman, 1998. Print.

Sagan, Lynn. "On the Origin of Mitosing Cdls." The Journal of Theoretical Biology 14 (167): 225-74. Web.

Wiley, E. O. Phylogenetics: The Theory and Practice of Phylogenetic Systematics. New York: Wiley, 1981. Print.

 

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