Cloud, Preston, author
Yale University, 1978
Buku Teks
Linton, Alan H., author
John Wiley & Sons, 1982
Buku Teks
Butterfield, Herbert, author
Cambridge University Press, 1969
Buku Teks
Butterfield, Herbert, author
Cambridge University Press, 1955
Buku Teks
Fukuyama, Francis, author
Qalam, 2004
Buku Teks