Nattaphanee Buadee และผู้แต่งคนอื่นๆ. (2008) Gemmological characteristics of corundum from Awissawella deposit, Ratanapura gem field, Sri Lanka. Chulalongkorn University:ม.ป.ท.Nattaphanee Buadee และผู้แต่งคนอื่นๆ. 2008. Gemmological characteristics of corundum from Awissawella deposit, Ratanapura gem field, Sri Lanka. ม.ป.ท.:Chulalongkorn University;Nattaphanee Buadee และผู้แต่งคนอื่นๆ. Gemmological characteristics of corundum from Awissawella deposit, Ratanapura gem field, Sri Lanka. ม.ป.ท.:Chulalongkorn University, 2008. Print.