Fagen, Richard
Blackwell, 1987
Buku Teks
Department of State, 1961
Buku Teks
edited by Lucian W. Pye and Sidney Verba
Princeton University Press , 1965
Buku Teks
edited by Andrew Blasko, Diana Januauskiene
Council for Research in Values and Philosophy, 2008
Buku Teks
Hogbin, Herbert Ian
Routledge and Kegan Paul, 1951
Buku Teks