Balmer และผู้แต่งคนอื่นๆ. (2011) Petrology, Geochemistry, and gemmological characteristics of marble-hosted ruby deposits of Morogoro and Mahenge, Tanzania. Chulalongkorn University:ม.ป.ท.Balmer และผู้แต่งคนอื่นๆ. 2011. Petrology, Geochemistry, and gemmological characteristics of marble-hosted ruby deposits of Morogoro and Mahenge, Tanzania. ม.ป.ท.:Chulalongkorn University;Balmer และผู้แต่งคนอื่นๆ. Petrology, Geochemistry, and gemmological characteristics of marble-hosted ruby deposits of Morogoro and Mahenge, Tanzania. ม.ป.ท.:Chulalongkorn University, 2011. Print.