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Saragih, Sahat and Napitupulu, E. Elvis (2015) DEVELOPING STUDENT-CENTERED LEARNING MODEL TO IMPROVE HIGH ORDER MATHEMATICAL THINKING ABILITY. International Education Studies, 08 (06). pp. 104-112. ISSN 1913-9020

Hutabarat, Wesly and Situmorang, Manihar and Sitorus, Marham and Situmorang, Zakarias (2015) THE DEVELOPMENT OF INNOVATIVE CHEMISTRY LEARNING MATERIAL FOR BILINGUAL SENIOR HIGH SCHOOL STUDENTS IN INDONESIA. International Education Studies, 08 (10). pp. 72-85. ISSN 1913-9020