1. Hester, T. R. & Shafer, H. J. in Archaeological Views from the Countryside: Village Communities in Early Complex Societies (eds Schwartz, G. M. & Falconer, S. E.) 48–63 (Smithsonian Institution, Washington DC, 1994).
2. Valdez, F. Jr The Prehistoric Ceramics of Colha, Northern Belize. Thesis, Harvard Univ. (1987).
3. Powis, T. G. & Hurst, W. J. Proc. 66th Annu. Meeting Soc. Am. Archaeol. (New Orleans, 2001).
4. Coe, S. D. & Coe, M. D. The True History of Chocolate (Thames & Hudson, London, 1996).
5. Tozzer, A. M. Landa's Relación de Las Cosas de Yucatán (Kraus Reprint, New York, 1941).