Craswell, Richard, author
Oxford University Press, 1994
Buku Teks
Burton, Steven J., editor
West Publishing Co., 1995
Buku Teks
compiled and edited by Harold Shepherd and Byron D. Sher
Foundation Press, 1960
Buku Teks
Simon, Michael S.
McGraw-Hill, 1979
Buku Teks
Schuck, Peter H., author
Oxford University Press, 1994
Buku Teks