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McKillop, Heather Irene (2004). The ancient Maya : new perspectives. Santa Barbara, Calif.: ABC-CLIO. p. 349. ISBN1-57607-697-0. OCLC56558696.
Houston, Stephen D.; Chinchilla Mazariegos, Oswaldo Fernando; Stuart, David (2001). The decipherment of ancient Maya writing. Norman, OK: University of Oklahoma Press. p. 14. ISBN0-8061-3204-3. OCLC44133070.