Singh, Harsimranjeet, and Harpreet Kaur. “Effect of NPK Fertilizers on Growth and Quality of Tomato (Solanum Lycopersicum L.) Under Heavy Clay Soils of Patiala”. International Journal of Economic Plants, vol. 9, no. Aug, 3, Aug. 2022, pp. 231-4, https://ojs.pphouse.org/index.php/IJEP/article/view/4743.