Schoenfeld, David
Oceana Publications, 1975
Buku Teks
Wilhelms, Fred T.
Gregg Pub. Division , 1959
Buku Teks
Troelstrup, Arch W.
McGraw-Hill , 1978
Buku Teks
Arini Faradinna
Fakultas Hukum Universitas Indonesia, 2013
UI - Skripsi (Membership)
editor by. James A. Maxwell
The Reader's Digest Association Inc., 1984
Buku Referensi