Forbes, vivian Louis, author
Singapore University Press, 2001
Buku Teks
Myles, Peter B., author
Routledge, 2017
Buku Teks
Walton, Richard E
Addison-Wesley, 1987
Buku Teks
Annisa Sathila Kusumaningtyas, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2017
UI - Tesis Membership
Duchacek, Ivo D., author
Holt, Rinehart and Winston, 1965
Buku Teks