<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebSite>
<https://hubslide.com/engr-syed-faraz-jafri/nadim-hassoun-structural-concrete-theory-and-design-4th-edition-s56d897ec8d070ead0ebfbfb9.html>