Somchit Opastrakul. 1996. Effect of genotype, nitrogen fertilizer rate and time of drainage on yield, milling quality and economic returns of rice production. Graduate School, Chiang Mai University;

Somchit Opastrakul. Effect of genotype, nitrogen fertilizer rate and time of drainage on yield, milling quality and economic returns of rice production. . Chiang Mai:Chiang Mai University, 1996.

Somchit Opastrakul. (1996) Effect of genotype, nitrogen fertilizer rate and time of drainage on yield, milling quality and economic returns of rice production . Chiang Mai University/Chiang Mai.