Northern Red-billed Hornbill
Sinclair, I. and Ryan, P. 2003. Birds of Africa South of the Sahara. Princeton University Press, Princeton and Oxford.
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- First online 27 June 2008
- Content changed 13 February 2009
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Tree of Life Web Project. 2009. Tockus erythrorhynchus. Northern Red-billed Hornbill. Version 13 February 2009 (temporary). http://tolweb.org/Tockus_erythrorhynchus/92769/2009.02.13 in The Tree of Life Web Project, http://tolweb.org/