MANGAT RAM, et al. “Productivity and Economics of Rice (Oryza Sativa)- Wheat (Triticum Aestivum) Cropping System As Affected by Establishment Methods and Tillage Practices”. Indian Journal of Agronomy, vol. 51, no. 2, Oct. 2001, pp. 77-80, https://doi.org/10.59797/ija.v51i2.4975.