Zweigert, Konrad, author
Clarendon Press, 1998
Buku Teks
Faculty of Law National University of Singapore, 2018
Majalah, Jurnal, Buletin
Brenncke, Martin, author
Intersentia, 2018
eBooks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Klasik
Oxford University Press, 2012
Buku Teks