Boutros-Ghali, Boutros, 1922-, author
United Nations, 1994
Buku Teks
Sartain, Libby, author
Amacom , 2003
Buku Teks
Sartain, Libby, author
[American Management Association, ], 2003
eBooks
Bowles, Chester, author
Harper & Brothers, 1958
Buku Teks
Artikel Jurnal