Knoll, Wolfgang
McGraw-Hil, 1992
Buku Teks
Haug, Hans
Henry Dunant Institute, 1993
Buku Teks
by Staffan Sohlman ...et al. ; translated from the Swedish by Roger G. Tanner
Pergamon Press, 1980
Buku Teks
Solomon, Richard H
University of California Press, 1971
Buku Teks
Machiavelli, Niccolo, author
Routledge & Kegan Paul, 1950
Buku Teks