Ruins:
Stephens, J. L. Incidents of travel in Yucatan, 1843.
Incidents of travel in Central America, Chiapas, and Yucatan, 1841.
Maudslay, A. P. Biologia Centrali-Americana Archaeology, 1889-1902.
Holmes, W. H. Archaeological Studies among the Ancient Cities of Mexico. (Field Columbian Museum, Anthropological Series, vol I, 1895-1897.)
Joyce, T. A. Mexican Archaeology. 1914.
Spinden, H. J. A study of Maya art. (Memoirs of the Peabody Museum, vol. VI, 1913.)
Gordon, G. B., Thompson, E. H., and Tozzer, A. M. in Memoirs of the Peabody Museum.
Hieroglyphic writing:
Bowditch, C. P. The numeration, calendar systems and astronomical knowledge of the Mayas, 1910.