Mehedi, T. A., M. A. Siddique, and S. B. Shahid. “Effects of Urea and Cowdung on Growth and Yield of Carrot”. Journal of the Bangladesh Agricultural University, vol. 10, no. 1, Oct. 2012, pp. 9-13, https://www.banglajol.info/index.php/JBAU/article/view/12012.