Lewis, David, author
Cambridge University Press, 2011
Buku Teks
White, Gordon
Clarendon Press, 1996
Buku Teks
Halavais, Alexander, author
Polity, 2009
Buku Teks
edited by Patrick Baert, Sokratis M. Koniordos, Giovana Procacci, Carlo Rizza
Routledge Kegan Paul, 2010
Buku Teks
Monga, Celestin, author
Lynne Rienner, 1996
Buku Teks