<https://www.pediapendidikan.com/2018/07/buku-guru-kelas-3-sd-tema-4-k13-revisi-2018.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.pediapendidikan.com/2018/07/buku-guru-kelas-3-sd-tema-4-k13-revisi-2018.html>