Read, P. G. (1983). Gemmological instruments: Their use and principles of operation (2nd ed.). Butterworths.
Chicago-Zitierstil (17. Ausg.)Read, Peter G. Gemmological Instruments: Their Use and Principles of Operation. 2nd ed. London: Butterworths, 1983.
MLA-Zitierstil (9. Ausg.)Read, Peter G. Gemmological Instruments: Their Use and Principles of Operation. 2nd ed. Butterworths, 1983.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.