Farnsworth, E. Allan, author
Oceana Publications,Inc, 1963
Buku Teks
Farnsworth, E. Allan, author
Oceana Publication, 1983
Buku Teks
Farnsworth, E. Allan
University casebook series, 1995
Buku Teks
Cross, Harry E.
University of California, Berkeley, 1981
Buku Teks
Goodman, Allan E
Westview Press, 1993
Buku Teks