Spier, J. (2001). A catalogue of the Calouste Gulbenkian collection of gems. Calouste Gulbenkian Foundation.
Čikaški stil citiranja (17. izdanje)Spier, Jeffrey. A Catalogue of the Calouste Gulbenkian Collection of Gems. Calouste Gulbenkian Foundation, 2001.
MLA način citiranja (8. izdanje)Spier, Jeffrey. A Catalogue of the Calouste Gulbenkian Collection of Gems. Calouste Gulbenkian Foundation, 2001.
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