:guide for ARS, NET, SRF, and other competition exams Raghavendra Chowdary, K creator Srishailam, B Muralikrishnan, L Settipalli Sravani text Delhi Jaya publishing house 2023 monographic 616p. English Agricultural extension communication Diffusion of innovation Farm journalism Research methodology CE 001.2 RAG/CO 9789356512344