Lockman, Zachary, author
Cambridge, 2004
Buku Teks
Bullard, Reader
Oxford university Press, 1958
Buku Teks
Morrison, Stanley Andrew, author
SCM Press, 1954
Buku Teks
Bill, James A., author
Little, Brown, 1979
Buku Teks
Harari, Maurice, author
Prentice-Hall, 1962
Buku Teks