Ariyawong, Onnicha, and Thanawan Phongsatha, PhD. 2017. “The Student’s Self-Designed Learning Activities Influencing Their Learning Achievement: A Case Study of an English Tutorial Center in Krabi”. ABAC ODI JOURNAL Vision. Action. Outcome 4 (2):28. http://www.assumptionjournal.au.edu/index.php/odijournal/article/view/2598.