Fagen, Richard
Blackwell, 1987
Buku Teks SO
Department of State, 1961
Buku Teks SO
edited by Lucian W. Pye and Sidney Verba
Princeton University Press , 1965
Buku Teks SO
Hemingway, Hilary
RuggedLand, [date of publication not identified]
Buku Teks
edited by Andrew Blasko, Diana Januauskiene
Council for Research in Values and Philosophy, 2008
Buku Teks SO