V.B. UPADHYAY, and S.K. VISHWAKARMA. “Long-Term Effect of Integrated Nutrient Management in Rice (Oryza sativa)wheat (Triticum Aestivum) Cropping System”. Indian Journal of Agronomy, vol. 59, no. 2, Oct. 2001, pp. 209-14, https://doi.org/10.59797/ija.v59i2.4566.