http://assets.cambridge.org/97805217/68733/cover/9780521768733.jpg
http://www.loc.gov/catdir/enhancements/fy1008/2010014637-b.html
http://www.loc.gov/catdir/enhancements/fy1008/2010014637-d.html
http://www.loc.gov/catdir/enhancements/fy1008/2010014637-t.html