UNICEF, 1963
Buku Teks
Haviland, H. Field, author
Carnegie Endowment for International Peace, 1951
Buku Teks
United Nations , 1990
Buku Teks
Severino, Rodolfo C., Jr., author
ISEAS, 2006
Buku Teks
Schwebel, Stephen M.
Harvard University Press, 1952
Buku Teks