Zweigert, Konrad, author
Clarendon Press, 1998
Buku Teks
Zweigert, Konrad, author
North-Holland, 1977
Buku Teks
Gutteridge, H. C.
Cambridge University Press, 1949
Buku Teks
David, Rene, 1906-, author
Stevens & sons, 1985
Buku Teks
Ehrenzweig, Albert A.
Leiden A.W. Sijthoff 1973,
Buku Teks