Visut Pisutha-Arnond and others. 1999. New evidence on the origin of Kanchanaburi sapphire. Bangkok:Department of Geology Chulalongkorn University;

Visut Pisutha-Arnond and others. New evidence on the origin of Kanchanaburi sapphire. Bangkok:Department of Geology Chulalongkorn University, 1999. Print.

Visut Pisutha-Arnond and others. (1999) New evidence on the origin of Kanchanaburi sapphire. Department of Geology Chulalongkorn University:Bangkok.