Tyler, Tom R.
Yale University Press, 1990
Buku Teks
Anaya, S. James, author
Oxford University Press, 2000
Buku Teks
Cheskin, Louis
N.Y. Liveright , 1959
Buku Teks
Friedman, David, author
Princeton and oxford, 2000
Buku Teks
Lipton, Michael, author
Harvard University Press, 1980
Buku Teks