Phillips, O. Hood
Sweet & Maxwell, 1987
Buku Teks
De Smith, S.A. (Stanley A.)
Penguin Books, 1994
Buku Teks
De Smith, S.A. (Stanley A.)
Penguin Education, 1973
Buku Teks
Phillips, O. Hood
Sweet & Maxwell, 2001
Buku Teks
Carroll, Alex, 1947-
Pearson Longman, 2007
Buku Teks