<http://www.kafijeni.com/2021/07/buku-siswa-mata-pelajaran-ips-kelas-ix.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.kafijeni.com/2021/07/buku-siswa-mata-pelajaran-ips-kelas-ix.html>