Wunderlich, Jens-Uwe, author
Routledge, 2010
Buku Referensi
Sklair, Leslie, author
Buku Teks
London: Tiger Books International, 1994,
Buku Referensi
Herod, Andrew, author
Willey Black well, 2009
Buku Teks
Bhagwati, Jagdish, author
Oxford University Press, 2004
Buku Teks