Source: Common Errors in English
12.28.2011
QUOTE ... UNQUOTE
Some people get upset at the common pattern by which speakers frame a quotation by saying “quote . . . unquote,” insisting that the latter word should logically be “endquote”; but illogical as it may be, “unquote” has been used in this way for about a century, and “endquote” is nonstandard.
Source: Common Errors in English
Source: Common Errors in English