Bilya Abdu, Mubarak Bature, Dauda Hasssan Lamutanni, and Sabir Bello Sadiq, trans. “Use of Leaves As Bio-Indicator to Assess Air Pollution Tolerance Index (APTI) And Elemental Concentration of Heavy Metals at Katsina Central Market Grinding Area, Katsina State-Nigeria”. International Journal of Scientific Research in Science and Technology 11, no. 3 (June 20, 2024): 679–688. Accessed October 25, 2025. https://www.ijsrst.technoscienceacademy.com/index.php/home/article/view/IJSRST24113238.