Ranate Songsawad และ Vichai Chutakositkanon. (2009) Lithostratigraphy of Part of Sao Khua Formation at Khao Phang Hoei Area, Amphoe Thepsatit, Changwat Chaiyaphum. <i>Bulletin of Earth Sciences of Thailand (BEST)</i>, <i>2</i>(2-Jan), 81-83.Ranate Songsawad และ Vichai Chutakositkanon. "Lithostratigraphy of Part of Sao Khua Formation at Khao Phang Hoei Area, Amphoe Thepsatit, Changwat Chaiyaphum". Bulletin of Earth Sciences of Thailand (BEST) 2 (2009):81-83.Ranate Songsawad และ Vichai Chutakositkanon. Lithostratigraphy of Part of Sao Khua Formation at Khao Phang Hoei Area, Amphoe Thepsatit, Changwat Chaiyaphum. Department of Geology, Chulalongkorn University:ม.ป.ท. 2009.