This is “Marking Words with Italics”, section 19.5 from the book Writers' Handbook (v. 1.0).
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Traditionally, underlining was used as a means of emphasis in handwritten text. Since the advent of the personal computer, italics have replaced underlining. If you are creating text by hand or by some other means where italics are not available, use underlining instead of italics.
As a rule, you should italicize the titles of published works, but you should not italicize parts of published works, such as a poem within a book, or unpublished works. Some exceptions that should be italicized include lengthy works, such as a very long poem within a book, and legal cases. Some exceptions that should not be italicized include titles of published short stories and titles of television shows. Works that are not italicized are typically placed in quotation marks. Some other exceptions that should not be italicized include long religious works, such as the Bible and the Koran, and easily recognizable texts, such as the US Constitution.
You might be tempted to use italics to emphasize a key phrase, word, or idea even though it doesn’t fall into any these categories. Fight off the temptation since an overuse of italics is distracting for readers.
Complete these sentences: