http://assets.cambridge.org/97805218/87762/cover/9780521887762.jpg
http://catdir.loc.gov/catdir/enhancements/fy1111/2011019853-b.html
http://catdir.loc.gov/catdir/enhancements/fy1111/2011019853-d.html
http://catdir.loc.gov/catdir/enhancements/fy1111/2011019853-t.html