Blackstone, Bernard, author
Harcourt, Brace, 1949
Buku Teks
Crosland, Margaret, author
Constable, 1981
Buku Teks
edited by Robert M. Maclean
[Publisher not identified], [Date of publication not identified]
Buku Teks
edited by Julian Lovelock
Macmillan, 1983
Buku Teks
edited by D.J. Palmer
Macmillan, 1991
Buku Teks