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Wahyuni, Rika and Simamora, Elmanani and Widyastuti, Eri (2008) STUDI TENTANG EFEKTIFITAS PEMBELAJARAN MATEMATIKA BERBASIS ON LINE LEARNING DI JURUSAN MATEMATIKA FMIPA UNIVERSITAS NEGERI MEDAN. Research Report. FMIPA Unimed, Medan.
Widyastuti, Eri and Susiana, and Siregar, Tiur Malasari (2016) GRAND DESIGN THE MODEL OF PROFESSIONAL DEVELOPMENT OF TEACHERS THROUGH PEER COACHING APPROACH. In: Proceeding AISTEEL The First Annual International Seminar on Transformative Education and Educational Leadership, 19 November 2016, Medan.