Chie Sakaguchi และ Walai Panich. (2008) Secondary school social studies curriculum comparison for mutual understanding : cases of Thailand and Singapore. Chulalongkorn University:ม.ป.ท.Chie Sakaguchi และ Walai Panich. 2008. Secondary school social studies curriculum comparison for mutual understanding : cases of Thailand and Singapore. ม.ป.ท.:Chulalongkorn University;Chie Sakaguchi และ Walai Panich. Secondary school social studies curriculum comparison for mutual understanding : cases of Thailand and Singapore. ม.ป.ท.:Chulalongkorn University, 2008. Print.