http://assets.cambridge.org/97805211/99520/cover/9780521199520.jpg
http://www.loc.gov/catdir/enhancements/fy1010/2010023744-b.html
http://www.loc.gov/catdir/enhancements/fy1010/2010023744-d.html
http://www.loc.gov/catdir/enhancements/fy1010/2010023744-t.html