Millar, T.B., author
Georgian House, 1972
Buku Teks
Leopold, Richard W., author
Alfred A. Knopf, 1962
Buku Teks
Pratt, Julius W., author
Prentice-Hall, 1965
Buku Teks
edited by Coral Bell
Australian National University Press, 1980
Buku Teks
Canberra, Australia : Department of Foreign Affairs
Majalah, Jurnal, Buletin