Hoenigswald, Henry M. and Woodard, Roger D. and Clackson, James P. T. 2004. Indo-European. In Woodard, Roger D. (ed.), The Cambridge Encyclopedia of the World's Ancient Languages, 534–550. Cambridge: Cambridge University Press.
@incollection{IndoeuropeanWoodard2004, address = {Cambridge}, author = {Hoenigswald, Henry M. and Woodard, Roger D. and Clackson, James P. T.}, booktitle = {The Cambridge Encyclopedia of the World's Ancient Languages}, editor = {Woodard, Roger D.}, pages = {534–550}, publisher = {Cambridge University Press}, title = {Indo-European}, year = {2004} }