Sirikit, Ruangdech, Manida Choptham, Panwasn Mahalawalert, Navarin Tagontong, and Supa Apinyapibal. 2017. “An Investigation of Differential Item Functioning and Differential Test Functioning Of Swusat During 2010-2013”. Scholar: Human Sciences 8 (2). http://www.assumptionjournal.au.edu/index.php/Scholar/article/view/2514.