Sultana, Zakia, Rajia Sultana, Md Rokonujjaman, Hasina Simol, Md Zakir Sultan, and Md Abdus Salam. “Impact of Gypsum and Potash Fertilizers on Heavy Metals and Nutrients Levels in Some Selected Leafy Vegetables and Assessment of Potential Health Risk”. Bangladesh Pharmaceutical Journal 22, no. 1 (January 31, 2019): 56-67. Accessed June 6, 2020.