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
Craswell, Richard, author
Oxford University Press, 1994
Buku Teks
Fuller, Lon L., author
West Publishing, 1964
Buku Teks
Scott, Robert E., author
Michie, 1988
Buku Teks