T. C. Thakur, T. K. Khura, R. Kishor, and S. J. Amdekar, “Economics of Custom Hiring of Combine Harvesters in North-Western Indo-Gangetic Plains of India - A Case Study”, JAE, vol. 41, no. 4, Dec. 2004, Accessed: Oct. 26, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/JAE/article/view/14716