Preecha Watanyoo. 1994. The study of socio-economic status of the farmers in Thaicansol project Chiang Mai province. crop year 1993/94. Bangkok:Land Development Department;
Preecha Watanyoo. (1994) The study of socio-economic status of the farmers in Thaicansol project Chiang Mai province. crop year 1993/94 (รายงานผลงานวิจัย). Land Development Department:Bangkok.
Preecha Watanyoo. The study of socio-economic status of the farmers in Thaicansol project Chiang Mai province. crop year 1993/94. Bangkok:Land Development Department, 1994.
Preecha Watanyoo. (1994) The study of socio-economic status of the farmers in Thaicansol project Chiang Mai province. crop year 1993/94 (รายงานผลงานวิจัย). Land Development Department:Bangkok.