S.K. Varma and B.P. Sinha. “A Measurement of Drudgery Involved in Selected Farm Operations”. Indian Journal of Extension Education 26, no. 1-2 (November 21, 2024): 49–54. Accessed July 15, 2026. https://epubs.icar.org.in/index.php/IJEE/article/view/160242.