N. Venkateshwar Rao, P.K. Jain , M. Jagan Mohan Reddy and N. Kishor Kumar 2017. Knowledge Mapping on Maize (Zea mays L) Production Technologies by The Farmers of Karimnagar District in Telangana State. Indian Journal of Extension Education. 53, 4 (Dec. 2017), 71–74.