<https://aklamasi.id/2015/04/09/perkuat-teori-melalui-studi-lapangan-2/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://aklamasi.id/2015/04/09/perkuat-teori-melalui-studi-lapangan-2/>