Fox, James R.
Oceana Publication, 1992
Buku Referensi
University of Malaya. The Faculty of Law, 1999
Majalah, Jurnal, Buletin
Erades, Judge
Martinus Nijhoff Publishers, 1983
Buku Teks
Zweigert, Konrad
North-Holland, 1977
Buku Teks
Schlesinger, Rudolf B.
Stevens & Sons, 1960
Buku Klasik