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Buku Referensi
Cheng, Yi-Li, author
[publisher not identified], [date of publication not identified]
Buku Referensi
Brown, David, author
Airlife Publishing LTD, 1995
Buku Teks
Nurul Annisa Hamudy, author
Badan Penelitian dan Pengembangan Kementerian Dalam Negeri, 2019
Artikel Jurnal
Nurul Annisa Hamudy, author
Artikel Jurnal