== Références ==
*Brian Stross, Mesoamerican Copal Resins, U-Mut Maya, 1997, vol. 6, p. 177-186. [[:en:Copal (Stross)|sur Pl@ntUse]] et sur [https://web.archive.org/web/20150212150136/http://www.utexas.edu/courses/stross/papers/copal.htm WaybackMachine].
*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.