Apiradee Phontaweenukul และ William T. Carlon. (2007) A survey of the opinion of native and Thai English teachers towards the problems of team teaching in supplementary English classes. Thammasat University,:ม.ป.ท.Apiradee Phontaweenukul และ William T. Carlon. 2007. A survey of the opinion of native and Thai English teachers towards the problems of team teaching in supplementary English classes. ม.ป.ท.:Thammasat University,;Apiradee Phontaweenukul และ William T. Carlon. A survey of the opinion of native and Thai English teachers towards the problems of team teaching in supplementary English classes. ม.ป.ท.:Thammasat University, 2007. Print.