Lucas, John
Cassell, 1980
Buku Referensi
Darrow-Kleinhaus, Suzanne
Thomson/west, 2007
Buku Teks SO
Barrett, Margreth
Emanuel Law Outlines, Inc., 1991
Buku Teks
Thompson, George C.
Wadsworth, 1965
Buku Teks
Andersen, William R.
Carolina Academic Press, 2010
Buku Teks