Finlay (2003)
Miller and Taube, loc. cit.
Ibid.
Schele, Linda; Mathews, Peter (1998). The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. New York: Simon & Schuster. pp. 113–114. ISBN 0684852098. 0684852098
Freidel, et al. (1993)
McDonald, J. Andrew (2016). "Deciphering the Symbols and Symbolic Meaning of the Maya World Tree". Ancient Mesoamerica. 27 (2): 333–359. doi:10.1017/s0956536116000249. ISSN 0956-5361. https://dx.doi.org/10.1017/s0956536116000249