http://assets.cambridge.org/97805217/68450/cover/9780521768450.jpg
http://www.loc.gov/catdir/enhancements/fy1009/2010017818-t.html
http://www.loc.gov/catdir/enhancements/fy1009/2010017818-d.html
http://www.loc.gov/catdir/enhancements/fy1009/2010017818-b.html