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*Howes, F.N., 1949. The copals. pp. 93-103. In ''Vegetable Gums and Resins''. 188 p. Waltham, USA, Chronica Botanica.
*De Laubenfels, D.J., 1989. ''Agathis''. pp 429-442. In ''Flora Malesiana'', Series I, Vol. 10. Dordrecht, The Netherlands, Kluwer Academic Publishers.
*NWFP 6. Coppen J.J.W., 1995. ''Gums, resins and latexes of plant origin''. FAO, Rome. 142 p. (''Non-Wood Forest Products'', '''6'''). [http://www.fao.org/docrep/v9236e/v9236e00.htm en ligne] ; [[:en:Copal (StrossFAO, NWFT 6)|Chapitre Copal sur Pl@ntUse]]
*Purata, S.E. (Ed.), 2008. Uso y manejo de los copales aromáticos: resinas y aceites. CONABIO/RAISES. i-60, 60 páginas, México.
*Tripplett, K.J., 1999. The ethnobotany of plant resins in the Maya cultural region of southern Mexico and Central America. PhD. dissertation, University of Texas, Austin.