Thawatchai Phaechamud และผู้แต่งคนอื่นๆ. (2008) Some Biological Activities and Safety of Mineral Pitch. <i>Silpakorn University Science and Technology Journal</i>, <i>2</i>(2), 7. - 17.Thawatchai Phaechamud และผู้แต่งคนอื่นๆ. "Some Biological Activities and Safety of Mineral Pitch". Silpakorn University Science and Technology Journal 2 (2008):7. - 17.Thawatchai Phaechamud และผู้แต่งคนอื่นๆ. Some Biological Activities and Safety of Mineral Pitch. Silpakorn University Research and Development Institute:ม.ป.ท. 2008.