Nantavit Pornpibul. 1994. The ability in using English for communication of undergraduate students majoring in English teaching in Higher Education Institutions under the Jurisdiction of the Ministry of the University Affairs. Bangkok:Thammasat University;
Nantavit Pornpibul. (1994) The ability in using English for communication of undergraduate students majoring in English teaching in Higher Education Institutions under the Jurisdiction of the Ministry of the University Affairs (รายงานผลงานวิจัย). Thammasat University:Bangkok.
Nantavit Pornpibul. The ability in using English for communication of undergraduate students majoring in English teaching in Higher Education Institutions under the Jurisdiction of the Ministry of the University Affairs. Bangkok:Thammasat University, 1994.
Nantavit Pornpibul. (1994) The ability in using English for communication of undergraduate students majoring in English teaching in Higher Education Institutions under the Jurisdiction of the Ministry of the University Affairs (รายงานผลงานวิจัย). Thammasat University:Bangkok.