United Nations , 1991
Buku Teks
Westview Press, 1991
Buku Teks
Richard Dean Burns, editor in chief
Charles Scribner's Sons, 1993
Buku Referensi
Richard Dean Burns, editor in chief
Charles Scribner's Sons, 1993
Buku Referensi
Richard Dean Burns, editor in chief
Charles Scribner's Sons, 1993
Buku Referensi