Sumonrat Tosukhowong. 1998. Motivation toward English learning and language learning strategies of NIDA students. Bangkok:National Institute of Development Administration;
Sumonrat Tosukhowong. (1998) Motivation toward English learning and language learning strategies of NIDA students (รายงานผลงานวิจัย). National Institute of Development Administration:Bangkok.
Sumonrat Tosukhowong. Motivation toward English learning and language learning strategies of NIDA students. Bangkok:National Institute of Development Administration, 1998.
Sumonrat Tosukhowong. (1998) Motivation toward English learning and language learning strategies of NIDA students (รายงานผลงานวิจัย). National Institute of Development Administration:Bangkok.