European politics in transition
by Christopher S. Allen [and others]
D.C. Health, 1987
 Buku Teks
Duranti, Marco
The conservative human rights revolution: European identity, transnational politics, and the origins of the European convention
Oxford University Press, 2017
 eBooks
Deutsch, Kenneth L.
An Invitation to political thought
Thomson, 2009
 Buku Teks
Bury, J.B.
A history of freedom of thught
Oxforkd Univ.Press, 1952
 Buku Teks
Gillis, Matthew Bryan
Heresy and dissent in the Carolingian Empire: the case of Gottschalk of Orbais
Oxford University Press, 2017
 eBooks