Apiyut Siyapan. 2002. Pull and push factors in international tourism of Thai tourists. Field of Study Technology of Environmental Management, Mahidol University;
Apiyut Siyapan. (2002) Pull and push factors in international tourism of Thai tourists . Mahidol University/Bangkok.
Apiyut Siyapan. Pull and push factors in international tourism of Thai tourists. . Bangkok:Mahidol University, 2002.
Apiyut Siyapan. (2002) Pull and push factors in international tourism of Thai tourists . Mahidol University/Bangkok.