noun ↑ “idiosyncracy”, in Dictionary.com Unabridged, Dictionary.com, LLC, 1995–present.
noun ↑ “idiosyncracy”, in The American Heritage Dictionary of the English Language, 4th edition, Boston, Mass.: Houghton Mifflin, 2000, →ISBN.
noun ↑ James A. H. Murray et al., editors (1884–1928), “Idiosyncrasy”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), London: Clarendon Press, →OCLC.
noun ↑ Webster's Third New International Dictionary (unabridged), Chicago, Illinois, Encyclopedia Britannica, Inc., 1993