Questia Online Library
（重定向自Questia）
Questia is an online commercial digital library of books and articles that has an academic orientation, with a particular emphasis on books and journal articles in the humanities and social sciences. The great majority of items are under copyright, for which Questia has paid a fee to the copyright owners. All the text in all the Questia books and articles is available to subscribers; the site also includes integrated research tools.