A.O. Ilesanmi , S.O. Adejuwon , O.Y. Halid. 2018. “On A Method of Estimating the Hidden Population of Drug Addicts”. International Journal of Emerging Trends in Science and Technology 5 (01), 6510-16. https://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1246.