De Smith, S.A. (Stanley A.), author
Penguin Books, 1994
Buku Teks
De Smith, S.A. (Stanley A.), author
Penguin Education, 1973
Buku Teks
Allen, Michael
Blackstone Press Ltd., s.a.
Buku Teks
Thompson, Brian
Blackstone press , 1997
Buku Teks
Phillips, O. Hood
Swett and Maxwell, 1973
Buku Teks