Ravi, V., A. Hridya, C. Suchitra, G. Byju, G. Suja, and M. M. Nair. “Comparison of Nitrate Reductase Activity in the Leaves of Tropical Root and Tuber Crops”. JOURNAL OF ROOT CROPS, vol. 37, no. 2, July 2013, p. 192, https://journal.isrc.in/index.php/jrc/article/view/48.