STEPHEN ISHAYA; SOGUNA MACDONALD DANIEL. INVESTIGATING THE MARKET INFILTRATION OF ADULTERATED ENGINE OIL IN NORTH-EASTERN NIGERIA. Journal of Arts and Sociological Research, Nigeria, v. 3, n. 6, 2024. Disponível em: https://africanscholarpub.com/ajasr/article/view/166.. Acesso em: 10 feb. 2026.