Wichit Silpamaneephan. 1994. Effect of land preparation on soil physical characteristics, germination and yield of cassava. Graduate School, Kasetsart University;
Wichit Silpamaneephan. (1994) Effect of land preparation on soil physical characteristics, germination and yield of cassava . Kasetsart University/Bangkok.
Wichit Silpamaneephan. Effect of land preparation on soil physical characteristics, germination and yield of cassava. . Bangkok:Kasetsart University, 1994.
Wichit Silpamaneephan. (1994) Effect of land preparation on soil physical characteristics, germination and yield of cassava . Kasetsart University/Bangkok.