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Minarni, Ani and Napitupulu, E. Elvis (2017) DEVELOPING INSTRUCTION MATERIALS BASED ON JOYFUL PBL TO IMPROVE STUDENTS MATHEMATICAL REPRESENTATION ABILITY. International Education Studies, 10 (09). pp. 23-38. ISSN 1913-9020

Saragih, Sahat and Napitupulu, E. Elvis and Fauzi, Amin (2017) DEVELOPING LEARNING MODEL BASED ON LOCAL CULTURE AND INSTRUMENT FOR MATHEMATICAL HIGHER ORDER THINKING ABILITY. International Education Studies, 10 (06). pp. 114-122. ISSN 1913-9020

Surya, Edy and Syahputra, Edi (2017) IMPROVING HIGH-LEVEL THINKING SKILLS BY DEVELOPMENT OF LEARNING PBL APPROACH ON THE LEARNING MATHEMATICS FOR SENIOR HIGH SCHOOL STUDENTS. International Education Studies, 10 (08). pp. 12-20. ISSN 1913-9020