Ziegler, David M.
Little, Brown, 1981
Buku Teks SO
Evera, Stephen van
[Publisher not identified], [Date of publication not identified]
Buku Teks SO
Schmitt, Michael N.
T.M.C. Asser Press, 2012
eBooks
Krasner, Stephen D.
Routledge, 2009
Buku Teks SO
Grob, Fritz
Yale University Press, 1949
Buku Klasik