@article {cite-key,
	title = {A Classification of the Biogeographical Provinces of the World},
	journal = {IUCN Occasional Paper (No. 18). International Union for Conservation of Nature and Natural Resources},
	number = {49},
	year = {1975},
	publisher = {Morges, Switzerland,},
	author = {Udvardy, M.D.F.}
}
