Somjate Pratummintra. 2000. Land production potentials modelling for rubber in east and northeast Thailand. Department of Land Management, Universiti Putra Malaysia;
Somjate Pratummintra. (2000) Land production potentials modelling for rubber in east and northeast Thailand . Universiti Putra Malaysia/Putra.
Somjate Pratummintra. Land production potentials modelling for rubber in east and northeast Thailand. . Putra:Universiti Putra Malaysia, 2000.
Somjate Pratummintra. (2000) Land production potentials modelling for rubber in east and northeast Thailand . Universiti Putra Malaysia/Putra.