NASREEN, SILAGUFTA, MAHMOOD AHMAD KHAWAJA, and IFTIKHIAR A AwAN. “P”. Biological Sciences - PJSIR 38, no. 5-6 (June 19, 1995): 215–219. Accessed June 8, 2025. http://biostaging.pjsir.org/index.php/biological-sciences/article/view/2478.