1. Principles of Tzeltal Plant Classification;Berlin,1974
2. Ethnobotany in Latin America;Hill,1945
3. Distribution of vegetation on Maya ruins and its relation to ancient land use at Lamanai, Belize;Lambert;Turrialba,1978
4. The practice of “Principias” in San José Succotz;Pendergast;Ethnos,1972
5. Chan Kom: A Maya Village;Redfield,1934