Potter, Pitman B., author
Appleton-Century-Crofts, 1948
Buku Teks
Huda Robbani, author
Fakultas Hukum Universitas Indonesia, 2013
UI - Skripsi (Membership)
Goodspeed, Stephen S., author
Oxford University Press, 1963
Buku Teks
Claude, Inis L., author
Random House, 1956
Buku Teks
Eagleton, Clyde
The Ronald Press, 1948
Buku Teks