Naijarun, Khwanchanok. 2021. “The Development of Learning Package by Using Crystal–Based Instructional Model to Enhance Literary Criticism of Undergraduate Student”. Journal of Education Studies 49 (3). Bangkok, Thailand:EDUCU4903007 (13 pages) doi: 10.14456/educu.2021.46. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/251565.