1. Applied Scientific Research Corporation of Thailand. 1966. An Initial List of Thai Medicinal Plants. Technol. Res. Inst., Bangkok.
2. Cronquist, A. 1981. An Integrated System of Classification of Flowering Plants. Columbia Univ. Press, New York.
3. Department of the Army. 1970. Minority groups in Thailand. Dept. Army Pamphlet #550-107, Washington, DC.
4. Geddes, W. R. 1976. Migrants of the Mountains. The Cultural Ecology of the Blue Miao (Hmong Njua) of Thailand. Clarendon Press, Oxford, England.
5. Grunfeld, F. V. 1982. Wayfarers of the Thai Forest. The Akha. Time-Life Books, Amsterdam.