edited by Craig Donnellan
Independence Educational, 1995
Buku Teks
Cruz, Hernan Santa
United Nations, 1971
Buku Teks
Stone, John, author
Polity Press, 2014
Buku Teks
Lerner, Natan, author
A.W. Sijthoff, 1970
Buku Teks
Morant, G.M., author
Unesco, 1958
Buku Teks