Votaw, Dow
Prentice-Hall, 1965
Buku Teks
Holden, Paul E., author
McGraw-Hill, 1951
Buku Teks
Brooks, Rhoda Smith
The New American Library, 1965
Buku Teks
Muhammad Farhan Darus, author
Fakultas Hukum Universitas Indonesia, 2018
UI - Skripsi (Membership)
Stigler, George J.
Princeton University Press , 1963
Buku Teks