Key, Harold and de Key, Mary Ritchie. 1953. Vocabulario Mejicana de la Sierra de Zacapoaxtla, Puebla. México, D. F.: Instituto Lingüístico de Verano.
@book{Key-and-Key-1953a, address = {México, D. F.}, author = {Key, Harold and de Key, Mary Ritchie}, publisher = {Instituto Lingüístico de Verano}, title = {Vocabulario Mejicana de la Sierra de Zacapoaxtla, Puebla}, year = {1953}, iso_code = {azz}, olac_field = {typology; general_linguistics; syntax}, wals_code = {nsz} }