1. Lowe, J. W. G. The Dynamics of Apocalypse (Univ. New Mexico Press, Albuquerque, 1985).
2. Gunn, J. & Adams, R. E. W. Wld Archaeol. 13, 87–100 (1981).
3. Folan, W. J. & Hyde, B. H. in Contributions to the Archaeology and Ethnohistory of Greater Mesoamerica (ed. Folan, W. J.) 15–48 (Southern Illinois Univ., Carbondale, 1985).
4. Folan, W. J., Gunn, J., Eaton, J. D. & Patch, R. W. Archaeology 10, 454–468 (1983).
5. Messenger, L. C. Jr Ancient Mesoamerica 1, 21–40 (1990).