↑“Retronym”. http://www.websters-online-dictionary.org/: Webster's Online Dictionary. 2013년 1월 20일에 원본 문서에서 보존된 문서. 2010년 3월 10일에 확인함. A word introduced because an existing term has become inadequate; "Nobody ever heard of analog clocks until digital clocks became common, so 'analog clock' is a retronym".Wordnet.
↑ 가나Safire, William (2007년 1월 7일). “Retronym”. 《New York Times Magazine》. 2015년 8월 1일에 확인함. The Merriam lexies, always strong on etymology, cite the earliest usage they can find of retronym in this column in 1980, which credited Frank Mankiewicz, then president of National Public Radio, as the coiner. He was especially intrigued by the usage hardcover book, which was originally a plain book until softcover books came along, which were originally called paperback and now have spawned a version the size of a hardcover but with a soft cover trade-named with the retronym trade paperback.
