Murtaza, Najma, Tahira B Sarfaraz, and Shaheen A Husain. 2001. “?STUDIES ON THE ISOLATION AND SCREENING OF INDIGENOUS CITRIC ACID PRODUCING STRAINS”. Biological Sciences - PJSIR 44 (3):175-77. http://v2.pjsir.org/index.php/biological-sciences/article/view/1910.