Barke, Michael, author
Longman Scientific & Technical, 1991
Buku Teks
Keohane, Robert O. (Robert Owen), 1941-, author
Longman, 2012
Buku Teks
Daillant, Georges, author
International Universities Bureau of the International Association of Universities, 1990
Buku Referensi
The Free Press, 1971
Buku Teks
Beneit, Emile ed.
N.Y. Columbia University Press , 1967
Buku Teks