1. D. Hunter, Papermaking, The History and Technology of an Ancient Craft, Dover Publications New York 1978.
2. B. Rudin, Making Paper, A look into the History of an Ancient Craft, Rudins, Vällingby, Sweden 1990.
3. R. Schwede, Ueber das Papier der Maya Codices, Dresden, Verlag von Richard Bertling 1912.
4. J. B. Glass, Catalogo de la Coleccion de Codices, Museo Nacional de Antropologia, Mexico (1964).
5. M. F. Cline, Guide to Ethnohistorical Sources, Handbook of Middle American Indians, Vol. 14, University of Texas Press, Austin, USA, 1973, pp. 133, 140.