Gomm, Roger
Palgrave McMillan, 2004
Buku Teks
Dahl, Robert A., 1915-2014
Columbia University Press, 1960
Buku Teks
Agger, Ben
Oxford University Press, 2013
Buku Teks
Fuchs, Christian
Sage Publications, 2014
eBooks
Basil Gomez and John Paul Jones III, edited
Wiley-Blackwell, 2010
Buku Teks