MLA style is a set of rules for publications, including research papers. It is used for publishing in the humanities and some sciences. 

There are two parts to citing in MLA: In-text citations and the Works Cited list.

In MLA, you must "cite" sources that you have paraphrased, quoted or otherwise used to write your research paper.

Cite your sources in two places:

1. In the body of your paper where you add a brief in-text citation.

2. In the Works Cited list at the end of your paper where you give more complete information for the source.