Ward, Barbara, author
Norton & Comp , 1957
Buku Teks
Bullard, Reader
Oxford university Press, 1958
Buku Teks
Morrison, Stanley Andrew, author
SCM Press, 1954
Buku Teks
Lockman, Zachary, author
Cambridge, 2004
Buku Teks
Fallows, James
Pantheon Books, 1994
Buku Teks