Hall, Kermit L.
Oxford University Press, 1991
Buku Teks SO
Mashaw, Jerry L
Thomson/West, 2009
Buku Teks SO
Merryman, John Henry
Bobbs-Merril, 1978
Buku Teks SO
Heaton, Russell
Blackstone, 1998
Buku Referensi
Stone, Richard
Blackstone Press, 1996
Buku Referensi