Include a complete citation for each source you refer to in your document. The citation should appear both in the text of the document and in a works cited or references list.

In the following examples, the writer includes MLA-style parenthetical citations that refer readers to a works cited list at the end of the document. Both MLA style and APA style use a combination of attributions and parenthetical information to refer to sources.

Jessica Richards argues, “We need to develop an efficient, cost-effective means of distributing hydrogen fuels before we can move to a hydrogen economy. If we don’t, we’ll be operating in crisis mode when the next serious oil shortage arrives” (322).

“We need to develop an efficient, cost-effective means of distributing hydrogen fuels before we can move to a hydrogen economy” (Richards 322).

Be sure to cite the page or paragraph numbers for paraphrased and summarized information as well as for direct quotations. The following paraphrase of Jessica Richards’s comments about energy needs includes the page number of the original passage in parentheses.

Jessica Richards argues that we need to create an “efficient, cost-effective” system for delivering hydrogen fuels now, instead of while we are facing a critical oil shortage (322).

To learn how to document sources using the MLA and APA documentation systems, see Chapters 21 and 22.