Mohammadzai, Imdad Ullah, Muhammad Irfan, Nadir Khan, Mumtaz Khan, and Saadya Usman. 2006. “Physical Characteristics, Inorganic Constituents and Trace Metals Determination in the Street-Vended Samples of Heroin”. Biological Sciences - PJSIR 49 (4):251-55. https://v2.pjsir.org/index.php/biological-sciences/article/view/1185.