โอฬาพิริยกุล ส. 2020. THE DEVELOPMENT OF MULTIMEDIA LEARNING KITS ON NATURAL PHENOMENA FOR PRE-ELEMENTARY STUDENTS AT SRINAKHARINWIROT UNIVERSITY: PRASARNMIT DEMONSTRATION SCHOOL (ELEMENTARY). Srinakharinwirot Research and Development Journal of Humanities and Social Sciences. 12, 23, January-June (Jun. 2020), 98–111.