Geographic variation in orangutan calls: implications for the evolution of language?. Wich, S. A. & van Schaik, C. P. American Journal of Physical Anthropology, (Suppl 48):271–272, 2009.
bibtex   
@article{wichGeographicVariationOrangutan2009,
	title = {Geographic variation in orangutan calls: implications for the evolution of language?},
	volume = {(Suppl 48)},
	issn = {0002-9483},
	journal = {American Journal of Physical Anthropology},
	author = {Wich, S. A. and van Schaik, C. P.},
	year = {2009},
	pages = {271--272},
}

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