Giddens, Anthony, author
IRCisoD, 2003
Buku Teks
Munmaya K. Mishra, Yusuf Yagci, editor
CRC press, 2009
Buku Referensi
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi (Open)
Jones, Joseph, author
University of Queensland Press, 1976
Buku Teks
Worrall, David
Harvester Wheatsheaf, 1992
Buku Teks