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== Références ==
*Brian Stross, Mesoamerican Copal Resins, U-Mut Maya, 1997, vol. 6, p. 177-186.
*Breedlove, D.E. & Laughlin, R.M., 1993. The flowering of Man : a Tzotzil botany of Zincantán. ''Smithsonian Contributions to Anthropology'', 35.
*Howes, F.N., 1949. The copals. pp. 93-103. In ''Vegetable Gums and Resins''. 188 p. Waltham, USA, Chronica Botanica.
