P. Kroeksakul, A. Naipinit, and T. P. N. Sakolnakorn, “The Economic And Social Effects Of Farmers Growing Para Rubber In Northeast Thailand: A Case Study Of Sapsomboon Village, Dun Sad Sub-District, Kranoun District, Khon Kaen Province”, JBCS, vol. 7, no. 1, Jan. 2011.