Mitton, Maureen
John Wiley & Sons, [date of publication not identified]
Buku Teks
Leach, Sid Del Mar
McGraw-Hill, 1983
Buku Teks
Massachusetts: Rockport Publishers,, 1997
Buku Teks
Drew, Philip
Law Book Company Limited, 1985
Buku Referensi
Pile, John F.
H.N. Abrams, 1995
Buku Teks