Chootummatouch, W., and P. Maneenit. “Yield Trial of Broccoli and Cabbsage Grown at Hygenic Fresh Vegetables during Rainy Season in Songkhla”. Thai Agricultural Research Journal, vol. 18, no. 1, Mar. 2000, pp. 31-44, doi:10.14456/thaidoa-agres.2000.3.