Supansa Toaree และผู้แต่งคนอื่นๆ. (2014) CHARACTERISTICS AND QUALITY ENHANCEMENT OF PRECIOUS OPAL FROM ETHIOPIA AND FIRE OPAL FROM MADAGASCAR. Chulalongkorn University:ม.ป.ท.Supansa Toaree และผู้แต่งคนอื่นๆ. 2014. CHARACTERISTICS AND QUALITY ENHANCEMENT OF PRECIOUS OPAL FROM ETHIOPIA AND FIRE OPAL FROM MADAGASCAR. ม.ป.ท.:Chulalongkorn University;Supansa Toaree และผู้แต่งคนอื่นๆ. CHARACTERISTICS AND QUALITY ENHANCEMENT OF PRECIOUS OPAL FROM ETHIOPIA AND FIRE OPAL FROM MADAGASCAR. ม.ป.ท.:Chulalongkorn University, 2014. Print.