Hacienda Chichen Resort and Yaxkin Spa recommended
you these references for Mayan Archaeology (5)

FAMSI
Foundation for Advancement of Mesoamerican Studies provides research
funds and Pre-Columbian educational resources: Images; Grantee Reports;
and Mesoamerican Bibliography.

Wikipedia on Chichen Itza
Online article about the Mayan ruins

Wikipedia on Maya People
Online article about the Mayan People

World-Mysteries.com
World-Mysteries.com's page on Chichen Itza

Yucatan Adventure
Chichen Itza's best online Travel Guide and Maya Civilization magazine
with interesting articles about:

Mayan Civilization   
Mayan Cosmovision
Mayan Sacred Rituals
Chichen Itza, Yucatan
Mayan Gods and Deities
Mayan Cultural Traditions
Mayan Calendar Systems