Hewett, E. L. (1936). Ancient life in Mexico and Central America. Bobbs-Merril.
Lua i Stíl Chicago (17ú heag.)Hewett, Edgar Lee. Ancient Life in Mexico and Central America. Indianapolis: Bobbs-Merril, 1936.
Lua MLA (9ú heag.)Hewett, Edgar Lee. Ancient Life in Mexico and Central America. Bobbs-Merril, 1936.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.