Naiyana Ponim. 1993. A comparative study of controlled and free writing English compositions of M.6 students. Faculty of Graduate Studies, Mahidol University;
Naiyana Ponim. (1993) A comparative study of controlled and free writing English compositions of M.6 students . Mahidol University/Bangkok.
Naiyana Ponim. A comparative study of controlled and free writing English compositions of M.6 students. . Bangkok:Mahidol University, 1993.
Naiyana Ponim. (1993) A comparative study of controlled and free writing English compositions of M.6 students . Mahidol University/Bangkok.