Adams, Kristen David, author
St. Paul, MN : West Group, 2010
Buku Teks
Corman, Calvin W., author
Little, Brown, 1983
Buku Teks
Ryder, Nicholas, author
Cambridge University Press , 2012
Buku Teks
Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi
Hung, William S.H., author
[Publisher not identified], 1932
Buku Teks