Heringa, A.W.
Metro, 2009
Buku Teks SO
Strong, C.F.
Sidgwick & Jackson Limited, 1960
Buku Teks SO
Strong, C.F.
Sidgwick and Jackson, 1972
Buku Teks
edited by Eivind Smith
Kluwer Law International, 1995
Buku Teks
Wells, S.J.
Cambridge University Press, 1964
Buku Teks