Niwat Kamtumsai. 2008. The relationship between achievement goal orientation and participation motivation in sport of athletes under the Ministry of Defense and under the National Police Bureau. Field of Study Sports Science, Mahidol University;
Niwat Kamtumsai. (2008) The relationship between achievement goal orientation and participation motivation in sport of athletes under the Ministry of Defense and under the National Police Bureau . Mahidol University/Bangkok.
Niwat Kamtumsai. The relationship between achievement goal orientation and participation motivation in sport of athletes under the Ministry of Defense and under the National Police Bureau. . Bangkok:Mahidol University, 2008.
Niwat Kamtumsai. (2008) The relationship between achievement goal orientation and participation motivation in sport of athletes under the Ministry of Defense and under the National Police Bureau . Mahidol University/Bangkok.