Llewellyn, Karl N.
Little, Brown and Company, 1960
Buku Teks
Jaya Ahmad Nurjaman
Fakultas Hukum Universitas Indonesia, 2020
UI - Tesis (Membership)
Schmidhauser, John R.
Little,Brown and Company, 1979
Buku Teks
Ajeng Tri Wahyuni
Fakultas Hukum Universitas Indonesia, 2008
UI - Skripsi (Open)
Mohd. Din
1996
UI - Tesis (Membership)