N.K. CHOPRA and NISHA CHOPRA, “Evaluation of tillage system and herbicides on wheat (Triticum aestivum) performance under rice (Oryza sativa)-wheat (Triticum aestivum) cropping system”, IJA, vol. 55, no. 4, pp. 304–307, Oct. 2001, doi: 10.59797/ija.v55i4.4756.