A. J. SINGH DHALIWAL & T. S. SOHAL. “Extension Contacts in Relation to Adoption of Agricultural Practices and Socio Socio-Economic Status of Farmers”. Indian Journal of Extension Education, vol. 1, no. 1, June 1965, pp. 58-62, https://epubs.icar.org.in/index.php/IJEE/article/view/159575.