Reginald Appleyard
International Organization for Migration, 2001
Buku Teks
Lubis, Todung Mulya, author
Gramedia Pustaka Utama, 1993
Buku Teks
Mullerson, Rein
Routledge, 1997
Buku Teks
Buku Teks
Andrew Ashworth, Alison Macdonald, Ben Emmerson
Sweet & Maxwell , 2012
Buku Teks