Wichyanont Sutthaso. 2003. Variable factors in behavior towards conservation of the natural resources and environment of Khao Yai national park. Field of Study Environmental Planning for Community and Rural Development, Mahidol University;

Wichyanont Sutthaso. Variable factors in behavior towards conservation of the natural resources and environment of Khao Yai national park. . Bangkok:Mahidol University, 2003.

Wichyanont Sutthaso. (2003) Variable factors in behavior towards conservation of the natural resources and environment of Khao Yai national park . Mahidol University/Bangkok.