Thanh Nguyen, P., Herman, H., Thuy To Nguyen, Q.L.H., Wayan Suparta, I. y Bich Huynh, V.D. 2019. Cleanliness Assessment of Sub-District in Regency Using Technique for Order Preference by Similarity to Ideal Solution. Opción. 35, (jun. 2019), 2899-2921.