Artikel Jurnal
edited by Ricardo Lopez Murphy
John Hopkins University Press, 1995
Buku Teks
edited by Juan J. Linz and Alfred Stepan
John Hopkins University Press, 1978
Buku Teks SO
edited by Fabio De Castro, Barbara Hogenboom, Michiel Baud
Palgrave Macmillan, 2016
Buku Teks SO
Council for Research in Values and Philosophy, 2005
Buku Teks SO