テキストラテック語族
Campbell, Lyle (1997) American Indian Languages, The Historical Linguistics of Native America, Oxford Studies in Anthropological Linguistics, Oxford University Press.
Paul R. (1969):"Proto-Chontal Phonemes", International Journal of American Linguistics, Vol. 35, No. 1 (Jan., 1969), pp. 34-37.
Viola Waterhouse (1985): "True Tequistlateco", International Journal of American Linguistics, Vol. 51, No. 4 (Oct., 1985), pp. 612-614.