Somkid Promma. 1993. Optimization of urea-treated rice straw feeding in crossbred holstein cattle. Graduate School, Kyushu Tokai University;
Somkid Promma. (1993) Optimization of urea-treated rice straw feeding in crossbred holstein cattle . Kyushu Tokai University/Tokyo.
Somkid Promma. Optimization of urea-treated rice straw feeding in crossbred holstein cattle. . Tokyo:Kyushu Tokai University, 1993.
Somkid Promma. (1993) Optimization of urea-treated rice straw feeding in crossbred holstein cattle . Kyushu Tokai University/Tokyo.