West , 1985
Buku Teks
National Politics Publishers, 1996
Buku Teks
Blume, William Wirt
Prentice-Hall, 1955
Buku Teks
Evelyn Mustika, author
Fakultas Hukum Universitas Indonesia, 2016
UI - Tesis (Membership)
Crabb, John H.
Fred B. Rothman and Company, 1982
Buku Teks