Taylor, Paul C., author
Polity Press, 2013
Buku Teks
Holland, Stephen, 1963-, author
Polity Press, 2017
Buku Teks
Angle, Stephen C., author
Polity Press, 2017
Buku Teks
Cornman, James W., author
Macmillan, 1968
Buku Teks
Hospers, John, author
Roudledge, 1988
Buku Teks