Buceros bicornis, The IUCN Red List of Threatened Species ver 3.1. Available. International, B. 2013.
bibtex   
@book{birdlife_international_buceros_2013,
	title = {Buceros bicornis, {The} {IUCN} {Red} {List} of {Threatened} {Species} ver 3.1. {Available}},
	language = {en},
	author = {Birdlife International},
	year = {2013},
}

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