S. Ramkumar • and P.S. Pushkaran. “Symbolic Adoption Behaviour of Participants of Correspondence Course”. Indian Journal of Extension Education 27, no. 3-4 (December 31, 1991): 116–117. Accessed October 24, 2025. https://epubs.icar.org.in/index.php/IJEE/article/view/160581.