Weston Bouchér
PDF) “Some Further Remarks on Greek Magical Gems” in A. Szabo (ed.), From Politês to Magos: Studia György Németh sexagenario dedicata (Budapest 2016) 105-115.
Sean Shrive Obituary (1953 - 2022) - Dundas, ON - The Hamilton Spectator
JoG 35 5, PDF, Gemstone
American Gem Trade Association
Orthoclase: Mineral information, data and localities.
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Spring 2017 Gems Gemology v2 PDF, PDF, Diamond
Preservation and Social Inclusion - Columbia GSAPP