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According to Wikipedia, a citation or bibliographic citation is a reference to a book, article, web page, or other published item with sufficient detail to identify the item uniquely.
Bad citations are references that are incorrect or incomplete due to author or publisher errors. They can vary from a simple typographical error in the page number to an incorrect journal/book name. The most common errors are an incorrect date of publication or journal name; however, author names are also misspelled fairly regularly.