Herman, Bedjo Sujanto, and Suryadi. 2020. “Evaluation of Implementation of Adiwiyata SMPN Program Tanjungpinang City Riau Islands Province”. Technium Social Sciences Journal 13 (1). Constanta, Romania:51-61. https://www.techniumscience.com.techniumscience.pluscommunication.eu/index.php/socialsciences/article/view/1959.