Stone, Richard
Blackstone Press limited, 1997
Buku Teks
Scott, F.R. (Francis Reginald), author
Published in co-operation with Carleton University by University of Toronto Press, 1959
Buku Teks
edited by Catherine Itzin
Oxford University Press, 1992
Buku Teks
Barker, Lucius J., author
Prentice-Hall, 1978
Buku Teks
Longaker, Richard P.
Cornell University Press, 1962
Buku Teks