Preecha Prathepha. (2016) Genotype frequency of black hull locus (Bh4) in weedy rice (Oryza sativa f. spontanea) populations. <i>Research & Knowledge</i>, <i>2</i>(1), page 41-47.Preecha Prathepha. "Genotype frequency of black hull locus (Bh4) in weedy rice (Oryza sativa f. spontanea) populations". Research & Knowledge 2 (2016):page 41-47.Preecha Prathepha. Genotype frequency of black hull locus (Bh4) in weedy rice (Oryza sativa f. spontanea) populations. Mahasarakham University:ม.ป.ท. 2016.