Sonam Choegyal และ Monamorn Precharattana. (2014) Development of a science learning unit to enhance high school students' understanding of rainbow based on predict-observe-explain approach. Mahidol University:ม.ป.ท.Sonam Choegyal และ Monamorn Precharattana. 2014. Development of a science learning unit to enhance high school students' understanding of rainbow based on predict-observe-explain approach. ม.ป.ท.:Mahidol University;Sonam Choegyal และ Monamorn Precharattana. Development of a science learning unit to enhance high school students' understanding of rainbow based on predict-observe-explain approach. ม.ป.ท.:Mahidol University, 2014. Print.