R. A. PARRAY, I. MANI, A. KUMAR, T. K. KHURA, and S. D. LANDE, “Pilot study of farm power-machinery status and custom-hiring opportunities in rice (Oryza sativa)-wheat (Triticum aestivum) cropping system”, Indian J Agri Sci, vol. 86, no. 2, pp. 167–72, Feb. 2016, doi: 10.56093/ijas.v86i2.55874.