Sukchai Pawakarnkadee. (2005) Extra curricular elementary school choirs : a case study of Bangkok Christian College boys' choir. Mahidol University,:ม.ป.ท.Sukchai Pawakarnkadee. 2005. Extra curricular elementary school choirs : a case study of Bangkok Christian College boys' choir. ม.ป.ท.:Mahidol University,;Sukchai Pawakarnkadee. Extra curricular elementary school choirs : a case study of Bangkok Christian College boys' choir. ม.ป.ท.:Mahidol University, 2005. Print.