Are titles of books underlined of have parenthesis -(big book-not short story)?

Titles of books are underlined. Parentheses aren't used in citing references, however, quote marks are used for works like short stories that are anthologized in larger volumes or poems. Purdue University has a good online site with instruction on MLA style citations: a href="http://owl.english.purdue.edu/owl/resource/557/02/" rel="nofollow"http://owl.english.purdue.edu/owl/resour…/a