Rodrigues, Aryon Dall'Igna. 1958. Classification of Tupí-Guaraní. International Journal of American Linguistics 24. 231–234. Indiana University.
@article{rodrigues1958classification, author = {Rodrigues, Aryon Dall'Igna}, journal = {International Journal of American Linguistics}, number = {3}, pages = {231–234}, publisher = {Indiana University}, title = {Classification of Tupí-Guaraní}, volume = {24}, year = {1958} }