SRIVASTAVA, S, et al. “Performance of Honey Bee (Apis Mellifera) on Toria (Brassics Rapa Var Napus) under Mid-Hill Subhumid Zone of Himachal Pradesh”. The Indian Journal of Agricultural Sciences, vol. 67, no. 10, May 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/30068.