Moncrieff, Gladys
Rigby, 1971
Buku Teks
Markus, John, 1911-
McGraw-Hill, 1994
Buku Referensi
edited by Abel Albet, Nuria Benach
Routledge, 2018
Buku Teks
Harris, Robert
Faber and Faber, 1984
Buku Teks
De Montfort University Law Monographs Cavendish Publishing Limited, [date of publication not identified]
Buku Teks