_Present population_:
TOZZER, A. M. A comparative study of the Mayas and the Lacandones,
1907.
_Maya language_:
TOZZER, A. M. A Maya grammar with bibliography and appraisement of the
works noted (_Papers of the Peabody Museum_, vol. IX,
1921.)
_Relation with surrounding cultures_:
SPINDEN, H. J. Ancient civilizations of Mexico and Central America.
(Handbook Series, No. 3, American Museum of Natural
History, 1917.)
The origin and distribution of agriculture in America.
(Proceedings of the 19th International Congress of
Americanists, New York, 1917.)
TOZZER, A. M. The domain of the Aztecs, (Holmes Anniversary Volume,
1916.)