Ashley, Kevin D.
Mass. MIT Press , 1990
Buku Teks
Monica Palmirani, editor
Springer-Verlag, 2012
eBooks
Grossman, George S., author
Oxford University Press, 1994
Buku Teks
Berch, Michael A., author
West, 2010
Buku Teks
Dowling, Noel T., author
Foundation Press, 1952
Buku Teks