Referensi
Buku:
https://books.google.co.id
https://libgen.is/
Artikel Ilmiah:
https://scholar.google.co.id/
Jurnal:
https://www.sciencedirect.com/
https://www.emeraldinsight.com/
https://books.google.co.id
https://libgen.is/
Artikel Ilmiah:
https://scholar.google.co.id/
Jurnal:
https://www.sciencedirect.com/
https://www.emeraldinsight.com/
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