Patharkar, S. A., S. H. Jain, A. V. Nerurkar, N. J. Patil, and P. N. Surve. “Estimation of Urinary Delta Aminolevulinic Acid (δ-ALA) Levels in Students of Age Group 15 to 25 Years As an Index of Lead Exposure”. International Journal of Biochemistry Research & Review, Vol. 29, no. 4, May 2020, pp. 12-16, doi:10.9734/ijbcrr/2020/v29i430181.