Tahir, F., and F. M. Chi. “PHYTOCHEMICAL AND ANTIMICROBIAL SCREENING OF THE LEAF AND ROOT BARK EXTRACTS OF CALOTROPIS PROCERA (Air)”. Biological Sciences - PJSIR, vol. 45, no. 5, Oct. 2002, pp. 337-40, https://v2.pjsir.org/index.php/biological-sciences/article/view/1832.