Sarwar, M. “RELATIVE DEGREE OF SUSCEPTIBILITY AND RESISTANCE OF BRASSICA CAMPESTRIS L. GENOTYPES AGAINST APHID MYZUS PERSICAEA FIELD INVESTIGATION”. The Nucleus, vol. 50, no. 1, Feb. 2013, pp. 81-86, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/779.