Sudsiri Katatikorn. 1999. Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis). Faculty of Graduate Studies, Mahidol University;

Sudsiri Katatikorn. Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis). . Bangkok:Mahidol University, 1999.

Sudsiri Katatikorn. (1999) Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis) . Mahidol University/Bangkok.