Allen, Frederick Lewis, author
Harper & Row, 1952
Buku Teks
The America University, [date of publication not identified]
Buku Teks
Ball, Victoria Kloss, author
John Wiley & Sons, 1980
Buku Teks
Harrington, Michael
Penguin Books, 1981
Buku Teks
Glosserman, Brad, author
Columbia University Press, 2015
Buku Teks