James D. Nations, The Maya tropical forest : people, parks, & ancient cities, University of Texas Press, , 323 p. (ISBN0-292-71318-5, lire en ligne), page 213.
James D. Nations, The Maya tropical forest : people, parks, & ancient cities, University of Texas Press, , 323 p. (ISBN0-292-71318-5, lire en ligne), page 213.