↑Key, Harold & Mary R. (1953). The phonemes of Sierra Nahuat. International Journal of American Linguistics 19. pp.53–56.{{cite book}}: CS1 maint: location (link) CS1 maint: location missing publisher (link)
↑Brockway, Earl (1963). The Phonemes of North Puebla Nahuatl. Anthropological Linguistics 5. pp.14–18.{{cite book}}: CS1 maint: location (link) CS1 maint: location missing publisher (link)