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Dr. Yuli Widiyono, M. Pd., yuli and Gabriela Catriona Taihuttu, S.Pi, M.Si, gabriela and Saripuddin, Amd., S.Pd.i., M.Pd.i., Saripuddin and Lutfi Henderlan Harahap, SP., M.Agr, lutfi (2024) Metodologi penelitian : buku referensi. PT.Media Penerbit Indonesia, Royal Suite No.6c,jalan Sedap malam IX Sempakarta kecamatan Medan. ISBN 978-634-7012-12-8