Wasaya, A., M. Tahir, T. A. Yasir, M. Akram, O. Farooq, and N. Sarwar. “Soil Physical Properties, Nitrogen Uptake and Grain Quality of Maize (Zea Mays L.) As Affected by Tillage Systems and Nitrogen Application”. Italian Journal of Agronomy, Vol. 13, no. 4, Oct. 2018, pp. 324-31, doi:10.4081/ija.2018.1197.