Aritsara Tranantasin และ Chamaipak Tayjasanant. (2011) Needs analysis of English for Thai health club's instructors in Bangkok. Kasetsart University,:ม.ป.ท.Aritsara Tranantasin และ Chamaipak Tayjasanant. 2011. Needs analysis of English for Thai health club's instructors in Bangkok. ม.ป.ท.:Kasetsart University,;Aritsara Tranantasin และ Chamaipak Tayjasanant. Needs analysis of English for Thai health club's instructors in Bangkok. ม.ป.ท.:Kasetsart University, 2011. Print.