Hashim Farooq, Yasir Jamil, Muhammad Raza Ahmad, Muhammad Afzal Ahmad Khan, Tahir Mahmood, Zeeshan Mahmood, Zia-ul-Haq, and Shakeel Ahmad Khan. “Lead Pollution Measurement Along National Highway and Motorway in Punjab, Pakistan”. Journal of Basic & Applied Sciences 8, no. 2 (July 5, 2012): 463–467. Accessed February 23, 2025. http://sceintific-array.org/index.php/jbas/article/view/817.