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Bu kavram başka kaynaklarda da geçiyor

• Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
• A Vocabulary of Criminal Slang (1915)
• The Slang Dictionary Etymological Historical and Anecdotal (1913)
• Appleton's Medical Dictionary (1913)
• The Nurse's Dictionary of Medical Terms and Nursing Treatment (1909)
• A Dictionary of Men's Wear (1908)
• Chamber's Twientieth Century Dictionary (1908)
• An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
• The Student's Medical Dictionary (1896)
• Chamber's Etymological of the English Language (1895)
• An Illustrated Encyclopedic Medical Dictionary (1893)
• Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
• Flip-flap — The Slang Dictionary Etymological Historical and Anecdotal (1913)
• flap dragon — The American Dictionary and Cyclopedia (1910)
• Flap-doodle — The American Dictionary and Cyclopedia (1910)