Heidensohn, Frances, author
Macmillan, 1989
Buku Teks
Macionis, John J., author
Prentice-Hall, 2000
Buku Teks
Tawney, R.H., author
A Harvest Book, 1948
Buku Teks
McClelland, David Clarence, author
The Free Press, 1967
Buku Teks
Schubert, Leo, author
Allyn and Bacob, 1972
Buku Teks