When citing a source with up to three authors, cite the names of all authors. For four or more authors, indicate first name only, followed by ' et al. ': Number of authors. Example of in-text citation. Davis, 2019 Davis and Barrett, 2019 If a source does not have an author, begin the MLA Works Cited entry with the title of the source. Use an abbreviated version of the title in your MLA in-text citation. If a source does not have a page number, you can use another locator, such as a chapter number or timestamp for a video or audio source, to identify the relevant passage in your in-text citation. If for in-text citations, Harvard referencing style uses the author-date format. In other words, Harvard style uses parenthetical and narrative citations that indicate the author's name and year of publication of the source. Harvard style does not use footnotes or endnotes. For more details on the in-text citation format for different source types. Citing an article in Chicago Style. In Chicago Notes and Bibliography style, you include a bibliographic entry for each source and cite them in the text using footnotes. A bibliographic entry for a journal article lists the title of the article in markups and the name of the journal in italics, both in title case. List the authors in full. The rules for in-text citations are slightly different. For sources with three to five authors, list all authors the first time and use “et al.” » only in later quotes. For sources with six or more authors, use “et al.” » from the first quote.