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A formal paper, such as a dissertation or a thesis, requires you to follow several formatting rules. The rules provide a structure for the paper, giving instructors the ability to work through the paper's ideas and to judge the validity of your arguments. Such rules also give you a standard, acceptable method for citing the sources that you've used to create your paper, and thereby avoiding inadvertently plagiarizing some material. Determining which set of formatting rules, or styles, to follow is a decision you and your instructor will need to make. A few different popular formats exist, including MLA Style, chiefly used for the humanities and liberal arts, along with APA Style and Chicago (Turabian) Style.