Shipley, R. M. (1951). Dictionary of gems and gemology: Including ornamental, decorative, and curio stones; a glossary of over 4000 English and foreign words, terms, and abbreviations which may be encountered in English literature or in the gem, jewelry, or art trades (5th ed.). Gemological Institute of America.
Chicago Style (17th ed.) CitationShipley, Robert M. Dictionary of Gems and Gemology: Including Ornamental, Decorative, and Curio Stones; a Glossary of over 4000 English and Foreign Words, Terms, and Abbreviations Which May Be Encountered in English Literature or in the Gem, Jewelry, or Art Trades. 5th ed. Los Angeles: Gemological Institute of America, 1951.
MLA (9th ed.) CitationShipley, Robert M. Dictionary of Gems and Gemology: Including Ornamental, Decorative, and Curio Stones; a Glossary of over 4000 English and Foreign Words, Terms, and Abbreviations Which May Be Encountered in English Literature or in the Gem, Jewelry, or Art Trades. 5th ed. Gemological Institute of America, 1951.