Kanjana Charttrakul,Kanjana Charttrakul..[et al.]. 2004. study of Bangkok vendors' satisfaction in using the English bookletKanjana Charttrakul..[et al.]. Bangkok:Suan Dusit Rajabhat University;

Kanjana Charttrakul,Kanjana Charttrakul..[et al.]. study of Bangkok vendors' satisfaction in using the English bookletKanjana Charttrakul..[et al.]. Bangkok:Suan Dusit Rajabhat University, 2004. Print.

Kanjana Charttrakul,Kanjana Charttrakul..[et al.]. (2004) study of Bangkok vendors' satisfaction in using the English bookletKanjana Charttrakul..[et al.]. Suan Dusit Rajabhat University:Bangkok.