Agha, Jan, et al. “Influence of Varying Nitrogen Levels on Performance of Wheat (Triticum Aestivum L.) under Semi-Arid Hot Climate of Kandahar, Afghanistan”. Annals of Agricultural Research, vol. 37, no. 4, May 2017, https://epubs.icar.org.in/index.php/AAR/article/view/69988.