Bernacchi, Richard L., author
Brown and Company, 1974
Buku Teks
Stokes, McNeill, author
McGraw-Hill, 1977
Buku Teks
Adams, Kenneth A., author
American Bar Association, 2008
Buku Teks
J. Wiley, 1965
Buku Teks
compiled and edited by Harold Shepherd and Byron D. Sher
Foundation Press, 1960
Buku Teks