Chant, Christopher
Chancellor Press , 1999
Buku Referensi
Myron H. Nordquist, Tommy T.B. Koh , John Norton Moore
Martinus NijHoff, 2009
Buku Teks
Gage, John D.
Cambridge University Press, 1992
Buku Teks
Departhemen of Geography University of Waterloo, 2005
Buku Teks
Bowett, D.W. (Derek William)
Manchester University Press, 1967
Buku Teks