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For the thoroughbred, see Citation (horse). For the criminal justice document, see summons.
A citation is a credit or reference to another document or source which documents both influence and authority. There are many rules for the format and use of such citations in different fields:
Varying rules and practices for citations apply in a science, a law, a theological citing of authority (e.g. the isnah which "back" the hadith in Islam), the prior art that applies in patent law, or marks applied in copyright.
Definitions of plagiarism, uniqueness or innovation, trustworthiness or reliability vary so widely among these fields that the use of citations has no simple common practice. In any of these fields the concept of a citation index can apply, which summarizes published citations of a given publication.
When using citations, one generally uses both a works cited page or section--also called the bibliography, source list or list of references--in conjunction with parenthetical citations (citations which refer the reader to a particular cited work). Some styles use Modern Language Association's (MLA) style is most often used in English studies, comparative literature, foreign-language literary criticism, and some other fields in the humanities. MLA style uses a Works Cited Page to list works at the end of the paper. Brief parenthetical citations, which include an author and page (if applicable), are used within the text. These direct readers to work of the author on the list of works cited, and the page of the work where the information is located (e.g. (Smith 107) refers the reader to page 107 of the work made by someone named Smith). More information can be found in the MLA Handbook for Writers of Research Papers.