Thanh Nguyen, Phong, Herman Herman, Quyen Le Hoang Thuy To Nguyen, I Wayan Suparta, and Vy Dang Bich Huynh. “Cleanliness Assessment of Sub-District in Regency Using Technique for Order Preference by Similarity to Ideal Solution”. Opción 350 (June 9, 2019): 2899-2921. Accessed October 30, 2025. https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/30142.