OttoBib.com is a website with a free tool to generate an alphabetized bibliography of books from a list of International Standard Book Numbers (ISBN) with output in MLA, APA, or Chicago/Turabian format. Each query also generates a permalink which can be used to recall the bibliography without reentering the ISBN data. The site is a metasearch engine, integrating data from several sources, including the U.S. Library of Congress API, the Amazon.com database of books, and ISBNdb.com. OttoBib accepts both ISBN-10 and ISBN-13