Palmer, Paula; Sánchez, Juanita; Mayorga, Gloria (1993). Taking care of Sibö's gifts : an environmental treatise from Costa Rica's KéköLdi Indigenous Reserve (2nd ed.). San José, Costa Rica: Asociación de Desarrollo Integral de la Reserva Indígena Cocles/KéköLdi. p. 57. ISBN9977880190. OCLC30936235.