Naritoom, C.; Simsiriwong, K.; Srijantr, T.; Tangtongharuthai, P.; Saridnirun, P.; Janprasert, J.; Trebuil, G. A Typology of Farming Systems Based on Their Functioning and History in Tambon Thung Khwang of Kamphaengsaen District. kasetsart J. Soc. Sci. 1990, 11, 141-150.