edited by Lawrence E. Harrison, Samuel P. Huntington
Basic Books, 2000
Buku Teks
Eisman, Louis
Prentice-Hall, 1964
Buku Teks
Knapp, Brian
Longman House, 1992
Buku Teks
Knapp, Brian J.
Longman, 1992
Buku Teks
Redfield, Robert
Chicago The University of Chicago Press 1950,
Buku Teks