<http://schema.org/url>
<http://books.simonandschuster.com:80/The-Collected-Works-of-W-B-Yeats-Volume-IV/William-Butler-Yeats/9780684807294>
<http://books.simonandschuster.com/The-Collected-Works-of-W-B-Yeats-Volume-IV/William-Butler-Yeats/9780684807294>