Kirchheimer, Otto
Princeton University press, 1961
Buku Teks
Low, Nicholas
Routledge, 1998
Buku Teks
Koopmans, Tim, author
Cambridge University Press, 2003
Buku Teks
Sterba, James P., author
Thomson Wadsworth, 2003
Buku Teks
edited by David Ingram
Blackwell , 2002
Buku Teks