Pornpun Vimooktalop และผู้แต่งคนอื่นๆ. (2006) A study of usefulness and enjoy ableness of communicative English activities as perceived by lower secondary demonstration school students. Chulalongkorn University:ม.ป.ท.Pornpun Vimooktalop และผู้แต่งคนอื่นๆ. 2006. A study of usefulness and enjoy ableness of communicative English activities as perceived by lower secondary demonstration school students. ม.ป.ท.:Chulalongkorn University;Pornpun Vimooktalop และผู้แต่งคนอื่นๆ. A study of usefulness and enjoy ableness of communicative English activities as perceived by lower secondary demonstration school students. ม.ป.ท.:Chulalongkorn University, 2006. Print.