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American Society for Training & Development, 2010
eBooks
oleh Andi Mallarangeng [and others] ; penyunting, Hasan Basri, Yanuar Jatnika
Bina Rena Pariwara, 1998
Buku Teks
Dreeni Geer, M. Abdus Sabur
Asian Resource Foundation, 2001
Buku Teks
Henry, Clement M., 1937-
Cambridge University Press, 2010
Buku Teks
Boutros-Ghali, Boutros, 1922-
United Nations, 1995
Buku Teks