Ellis, Harry B
The Roland Press, 1956
Buku Teks
edited by Peter Mansfield
Oxford University Press, 1973]
Buku Teks
Goldschmidt, Arthur, author
Westview Press, 1983
Buku Teks
Royal Institute of International Affairs, 1954
Buku Teks
Yahya Armajani
Prentice-Hall, [date of publication not identified]
Buku Teks