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Rigg และผู้แต่งคนอื่นๆ. 1985. The problems of agricultural intensification in a marginal rainfed environment : a study of farmer practices and government policies in two villages in Northeastern Thailand. London:University of London;
Rigg และผู้แต่งคนอื่นๆ. (1985) The problems of agricultural intensification in a marginal rainfed environment : a study of farmer practices and government policies in two villages in Northeastern Thailand (รายงานผลงานวิจัย). University of London:London.
Rigg และผู้แต่งคนอื่นๆ. The problems of agricultural intensification in a marginal rainfed environment : a study of farmer practices and government policies in two villages in Northeastern Thailand. London:University of London, 1985.
Rigg และผู้แต่งคนอื่นๆ. (1985) The problems of agricultural intensification in a marginal rainfed environment : a study of farmer practices and government policies in two villages in Northeastern Thailand (รายงานผลงานวิจัย). University of London:London.