Iqbal, Muhammad Zafar, and Muhammad Shafiq. “?TOXIC EFFECTS OF ZINC ONDIFFERENT TREE SEEDLINGS”. Biological Sciences - PJSIR 42, no. 3 (June 21, 1999): 150–153. Accessed May 16, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/2138.