Makalah Pertemuan Ilmiah PBI 2013
. The Differentiation Of Students Learning Achievement And Critical Thinking Between The Using Of Learning Video And Graphic As Media In Problem Based Learning (Pbl) Model In Sma Negeri 3 Medan. In: Seminar Nasional ke-22 Perhimpunan Biologi Indonesia. Seminar Nasional ke-22 Perhimpunan Biologi Indonesia. Purwokerto, Jawa Tengah, Indonesia: Fakultas Biologi Unsoed; 2013.
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