Tudsri, S., B.R. Watkin, A.C.P. Chu, and B.J. Forde. 2001. “Factors Affecting Lotus Rhizome Production in Nakhon Ratchasima Province and Roi Et Province”. Kasetsart Journal of Social Sciences 22 (1):98-109. https://so04.tci-thaijo.org/index.php/kjss/article/view/243520.