Geus, Armin
T.F.H. Publisher, 1995
Buku Teks
Gage, John D.
Cambridge University Press, 1992
Buku Teks
Devaux, Bernard
Barron's Educational Series, 2000
Buku Referensi
Bowett, D.W. (Derek William)
Manchester University Press, 1967
Buku Teks
Dimas Akbar
Fakultas Hukum Universitas Indonesia, 2012
UI - Skripsi Open