RAKESH KUMAR VERMA, et al. “Productivity and Profitability of Wheat (Triticum Aestivum) As Influenced by Different Cropping Systems and Nutrient Sources”. Indian Journal of Agronomy, vol. 61, no. 4, Oct. 2001, pp. 429-35, https://doi.org/10.59797/ija.v61i4.4408.