Singh, P.K., D.R. Singh, and Ved Byas Singh. 2010. “Effect of Nitrogen, Phosphorus and Bio-Fertilizer (Azotobacter) on Growth, Yield and Quality of Okra”. Indian Journal of Horticulture 67 (Special Issue):477-78. https://journal.iahs.org.in/index.php/ijh/article/view/2224.