Arshad, Imran. “Effect of Different Levels of Water Soluble NPK(20-20-20) Fertilizer on the Growth and Yield of White Radish (Raphanus Sativus L.)”. PSM Biological Research 2, no. 2 (April 28, 2017): 74-78. Accessed October 15, 2019. https://journals.psmpublishers.org/index.php/biolres/article/view/63.