<https://www.david-amador.com/2013/07/lets-take-a-look-at-sdl-game-development-book/#personImage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.david-amador.com/2013/07/lets-take-a-look-at-sdl-game-development-book/>