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
Hoof, G.J.H. van
Pemikiran kembali sumber-sumber hukum internasional = Rethinking the sources of international law
Alumni, 2000
 Buku Teks
International investment law : the sources of rights and obligations
BRILL, 2012
 Buku Teks
Shaw, Malcolm Nathan, 1947-
International law
Cambridge University Press, 2017
 Buku Teks
Fenwick, Charles G.
International law
Appleton-Century-Crofts, 1948
 Buku Teks