Kaehlig, Carl-Bernd, author
Tata Nusa, 1993
Buku Referensi
M. Hawin, author
Gadjah Mada University Press, 2010
Buku Teks
Aditya Harin Nugroho, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Skripsi (Membership)
Eastaway, Nigel, author
Sweet & Maxwell, 2008
Buku Teks
Caenegem, William van, author
Bond University Law School, 1994
Buku Teks