Novianti, author
Universitas Indonesia, 2008
UI - Skripsi (Open)
Lenin, Vladimir I., author
Foreign Languages Publishing House, 1959
Buku Teks
Edgell, Stephen, author
Routledge, 1993
Buku Teks
Universitas Indonesia, 2008
UI - Skripsi (Membership)
Grave, Damian, author
Thomson Reuters, 2009
Buku Teks