Should you underline article titles?

In MLA style, the titles of articles are placed in quotation marks. As a rule of thumb, the smaller sections of a complete work go in quotation marks. The titles for articles, chapters and songs go in quotation marks, while magazine, book and CD titles are underlined or italicized.

Style guides differ on whether complete works are italicized or underlined. If no specific style guide has been assigned, writers are free to choose either underlining or italics, but it's important to be consistent throughout the paper. Television series, films, works of art and newspapers are also either italicized or underlined, while photographs generally appear in quotation marks.