Zaman, M., M. A. Rahman, T. Chowdhury, and M. Chowdhury. “Effects of Combined Application of Chemical Fertilizer and Vermicompost on Soil Fertility, Leaf Yield and Stevioside Content of Stevia”. Journal of the Bangladesh Agricultural University, vol. 16, no. 1, Apr. 2018, pp. 73-81, https://www.banglajol.info/index.php/JBAU/article/view/36484.