Cooper

Bu kavram başka kaynaklarda da geçiyor

• The Slang Dictionary Etymological Historical and Anecdotal (1913)
• Everybody's Encyelopedia (1912)
• The American Dictionary and Cyclopedia (1909)
• Chamber's Twientieth Century Dictionary (1908)
• Pears Shilling Cyclopedia (1898)
• Phrases and Names Their Origins and Meanings (1896)
• Chamber's Etymological of the English Language (1895)
• Modern English Biography (1892)
• Nuttall's Standard Dictionary of the English Language (1890)
• A Biographical Dictionary of Freethinkers of All Ages and Nations (1889)
• Zell's Condensed Dictionary (1879)
• COOPER UNION — Adair's New Encyclopedia (1923)
• Broad-Cooper — The Slang Dictionary Etymological Historical and Anecdotal (1913)