Sources of international uniform law = Sources du droit uniforme international = Quellen des internationalen einheitsrechts
edited by Konrad Zweigert and Jan Kropholler
A.W. Sijthoff, [Date of publication not identified]
 Buku Teks SO
Hoof, G.J.H. van
Pemikiran kembali sumber-sumber hukum internasional = Rethinking the sources of international law
Alumni, 2000
 Buku Teks SO
International investment law : the sources of rights and obligations
BRILL, 2012
 Buku Teks
International law and international relations
edited by Beth A. Simmons and Richard H. Steinberg
Cambridge University Press, 2006
 Buku Teks SO
Shaw, Malcolm Nathan, 1947-
International law
Cambridge University Press, 2017
 Buku Teks SO