Makarczyk, Jerzy
Principles of a new international economic order: a study of international law in the making / by Jerzy Makarczyk
Martinus Nijhoff, 1988
 Buku Teks
Kelsen, Hans
Principles of international law
Holt, Rinehart and Winston, 1967
 Buku Teks
Marasinghe, Lakshman
Principles of international trade law
Butterworth Asia, 1998
 Buku Teks
Principles of international environmental law
by Philippe Sands [and others]
Cambridge University Press, 2012
 Buku Teks
Crowe, Jonathan
Principles of international humanitarian law
Edward Elgar, 2013
 Buku Teks