Hoffmann, Stanley
N.Y. Praeger , 1965
Buku Teks
Ziegler, David M., author
Little, Brown, 1981
Buku Teks
Evera, Stephen Van
[publisher not identified], [date of publication not identified]
Buku Teks
Schmitt, Michael N., author
T.M.C. Asser Press, 2012
eBooks
Krasner, Stephen D., author
Routledge , 2009
Buku Teks