Gellhorn, Ernest
West Publishing Company, 1972
Buku Teks SO
Davies, Jack
West Group, 1986
Buku Teks
Rose, Francis
Sweet & Maxwell, 1989
Buku Teks SO
Findley, Roger W.
West Publishing, 1992
Buku Teks
Hamilton, Robert W.
West Publishing, 1996
Buku Teks