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4. ^{{Cite book|url=https://books.google.com/books?id=E2imSyZZDh0C|title=The Encyclopedia of Phobias, Fears, and Anxieties, Third Edition|last=Doctor|first=Ronald Manual|last2=Kahn|first2=Ada P.|last3=Adamec|first3=Christine A.|date=2010-05-12|publisher=Infobase Publishing|isbn=978-1-4381-2098-0|language=en|page=361}}