KUALITAS PELAYANAN PENGANGKUTAN SAMPAH DAN KAITANNYA DENGAN EKSTERNALITAS NEGATIF DI JALAN GARU 2, MEDAN AMPLAS. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 9, n. 5, p. 8227 – 8234, 2026. DOI: 10.54314/jssr.v9i5.7312. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/7312.. Acesso em: 17 oct. 2026.