Use parenthetical citations within the text of your paper when using MLA documentation. Insert the author's last name and page number of the source in parentheses after the words or ideas taken from another source. Place them where a pause would naturally occur to avoid disrupting your writing. Parenthetical citations are usually placed at the end of a sentence. These parenthetical references refer to sources listed on the "Works Cited" page at the end of your paper. The "Works Cited" page should list, in order, the alphabetized author's name, title of the article, name of the periodical, series information, issue number, date the work was published and page numbers.
Cite your source, as in the MLA system, by placing the author's last name and page number in parentheses each time you borrow from it when using APA documentation. Each of these parenthetical citations, except for personal communications, such as letters, e-mail or phone conversations, must be matched to an entry in an alphabetized list called "References" at the end of your paper. Each item in the "References" list should, in turn, be cited in the text. The general form for reference entries is the alphabetized author's name, year of publication, title of the article, publishing location and name of publisher.
Document your sources when using the Chicago style by using footnotes or endnotes and a bibliography. Place a superscript number after the sentence containing the borrowed material. This number refers to a listing of the source listed in your footnotes or endnotes. Footnotes or endnotes should list, in order, the author's first name then last name, title of the article, publishing location, name of publisher, date of publication and page numbers. The first time you cite a source, include the publishing information for that work as well as the page number where the cited information can be found. For succeeding references to a source you have already listed, give only the author's name, followed by the page cited. The bibliography is formatted similar to footnotes or endnotes, except the author's last name is listed first and the list is alphabetized.