Ethnologue: Paraguay Languages of Paraguay. Part of _Ethnologue: Languages of the World_, 13th Edition; Barbara F. Grimes, Editor; Summer Institute of Linguistics, 1996. [eng]
Ethnologue: Argentina Languages of Argentina. Part of _Ethnologue: Languages of the World_, 13th Edition; Barbara F. Grimes, Editor; Summer Institute of Linguistics, 1996. [eng]