Tracey, Richard R.S., author
Butterworth, 1975
Buku Teks
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
Hart, James, author
Appleton-Century-Crofts, 1950
Buku Teks