Sijabat, Dea Clara Clara May Christin, Science Education Study Program, Biology Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Indonesia (Indonesia)
Silaban, Awy, Natural Science Study Program, Biology Department, Faculty of Mathemathics and Natural Science, Universitas Negeri Medan (Indonesia)
Silaban, Ramlan, Dapertemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Silaban, Ramlan, Department of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan, Indonesia (Indonesia)
Silaban, Ramlan, Universitas Negeri Medan (Indonesia)

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