<http://schema.org/alternativeHeadline>
"More than 100 of Quora\u2019s all-time best answers are now available as a free, 400-page PDF book"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/media/2013/01/15/quoras-top-writers-book-2010-2012-is-now-available-download-for-free/>