Carnoy, Martin
Princeton University press, 1984
Buku Teks
Waldo, Dwight, author
Ronald Press, 1948
Buku Teks
Joni Lovenduski
Cambridge University Press, 2005
Buku Teks
New York : Cambridge University Press, 2005
Buku Teks
Gough, Ian, author
Macmillan, 1992
Buku Teks