National Crime Prevention Centre Government of Canada, 2001
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Rosa Agustina, author
s.n., 2008
Buku Teks
Oppusunggu, Yu Un, author
Universitas Indonesia, 2009
Buku Teks
Lubis, Todung Mulya, author
Universitas Indonesia, 1991
Buku Teks
Lubis, Todung Mulya, author
Universitas Indonesia, 1995
Buku Teks