Sinurat, Dian I, Universitas Negeri Medan (Indonesia)
Sipayung, Murdoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sirait, Gloria, Department of Biology Education, Faculty of Teaching and Education, Universitas HKBP Nommensen Pematangsiantar, Pematangsiantar, Indonesia (Indonesia)
Sirait, Ribka J, Universitas Negeri Medan (Indonesia)
Sirait, Ribka, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan

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