Birkhauser Verlag, 1972
Buku Teks
edited by Lawrence E. Harrison, Samuel P. Huntington
Basic Books, 2000
Buku Teks
Redfield, Robert, author
Chicago The University of Chicago Press 1950,
Buku Teks
Eisman, Louis, author
Prentice-Hall, 1964
Buku Teks
Knapp, Brian, author
Longman House, 1992
Buku Teks