Pitcha Sirirat. ม.ป.ป. Development of the black pepper dehuller. , ม.ป.พ.;
Pitcha Sirirat. (ม.ป.ป.) Development of the black pepper dehuller . ม.ป.พ./ม.ป.ท.
Pitcha Sirirat. Development of the black pepper dehuller. . ม.ป.ท.:ม.ป.พ., ม.ป.ป.
Pitcha Sirirat. (ม.ป.ป.) Development of the black pepper dehuller . ม.ป.พ./ม.ป.ท.