Parames Laosinchai และ Bhinyo Panijpan. (2011) Employing concrete models in a scaffolded learning unit to facilitate secondary and tertiary students' derivation of basic series formulars. Mahidol University:ม.ป.ท.Parames Laosinchai และ Bhinyo Panijpan. 2011. Employing concrete models in a scaffolded learning unit to facilitate secondary and tertiary students' derivation of basic series formulars. ม.ป.ท.:Mahidol University;Parames Laosinchai และ Bhinyo Panijpan. Employing concrete models in a scaffolded learning unit to facilitate secondary and tertiary students' derivation of basic series formulars. ม.ป.ท.:Mahidol University, 2011. Print.