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Sitorus, Elsa Nopita and Surya, Edy (2017) THE INFLUENCE OF TEAMS GAMES TOURNAMENT COOPERATIVE LEARNING MODEL ON STUDENTS’ CREATIVITY LEARNING MATHEMATICS. International Journal of Sciences : Basic and Applied Research (IJSBAR), 34 (01). pp. 16-24. ISSN 2307-4531
Sitorus, Elsa Nopita and Purba, Martina Mutiara (2017) PENGARUH MODEL PEMBELAJARAN GERLACH DAN ELY TERHADAP KEMAMPUAN KOMUNIKASI MATEMATIKA SISWA. In: Seminar Nasional Matematika (SEMNASTIKA) 2017, 06 May 2017, Medan.
Sitorus, Elsa Nopita (2019) ANALISIS KESULITAN PROSES BERPIKIR KREATIF MATEMATIS SISWA DALAM PEMBELAJARAN BERBASIS MASALAH (PBM) DI SMP NEGERI 13 MEDAN. Masters thesis, UNIMED.