Chotiros Permpikul. 1999. A comparative analysis of Thai and English contrastive discourse markers : with a discussion of the pedagogical implications. Graduate School, Boston University;
Chotiros Permpikul. (1999) A comparative analysis of Thai and English contrastive discourse markers : with a discussion of the pedagogical implications . Boston University/Boston.
Chotiros Permpikul. A comparative analysis of Thai and English contrastive discourse markers : with a discussion of the pedagogical implications. . Boston:Boston University, 1999.
Chotiros Permpikul. (1999) A comparative analysis of Thai and English contrastive discourse markers : with a discussion of the pedagogical implications . Boston University/Boston.