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Sitinjak, Elvri Melliaty, Department of Chemical Engineering, Politeknik Teknologi Kimia Industri, Medan (Indonesia)
Sitompul, Bramwell, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
Sitompul, Nopita, Natural Science Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Sitorus, Marham, Universitas Negeri Medan (Indonesia)
Sitorus, Marham, Jurusan Kimia, FMIPA Universitas Negeri Medan (Indonesia)
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