Stephen Ishaya and Soguna Macdonald Daniel, “INVESTIGATING THE MARKET INFILTRATION OF ADULTERATED ENGINE OIL IN NORTH-EASTERN NIGERIA”, AJASR, vol. 3, no. 6, Feb. 2024, Accessed: Nov. 11, 2026. [Online]. Available: https://africanscholarpub.com/ajasr/article/view/166