Kaufman, Terence and Justeson, John. 2004. Epi-Olmec. In Woodard, Roger D. (ed.), The Cambridge Encyclopedia of the World's Ancient Languages, 1071–1111. Cambridge: Cambridge University Press.
@incollection{EpiolmecWoodard2004, address = {Cambridge}, author = {Kaufman, Terence and Justeson, John}, booktitle = {The Cambridge Encyclopedia of the World's Ancient Languages}, editor = {Woodard, Roger D.}, pages = {1071–1111}, publisher = {Cambridge University Press}, title = {Epi-Olmec}, year = {2004} }