<strong>ISBN numbers</strong>
 
x17 ISBN 0-1234-56789 x17
y17 
 <a href="http://www.amazon.com/exec/obidos/ISBN=0123456789" class="external" target="_blank" title="Amazon">ISBN 0-1234-56789</a>
  (
 <a href="http://shop.barnesandnoble.com/bookSearch/isbnInquiry.asp?isbn=0123456789" class="external" target="_blank" title="Barnes & Noble">alternate</a>
 , 
 <a href="http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=0123456789" class="external" target="_blank" title="FatBrain">alternate</a>
 ) y17
x18 ISBN   1234-56789-X x18
y18 
 <a href="http://www.amazon.com/exec/obidos/ISBN=123456789X" class="external" target="_blank" title="Amazon">ISBN 1234-56-789-X</a>
  (
 <a href="http://shop.barnesandnoble.com/bookSearch/isbnInquiry.asp?isbn=123456789X" class="external" target="_blank" title="Barnes & Noble">alternate</a>
 , 
 <a href="http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=123456789X" class="external" target="_blank" title="FatBrain">alternate</a>
 ) y18
z18 ISBN   12 34-56 -  789-X-3043 z18
x19 [ISBN: 1234567] x19
x20 
 <a href="http://www.amazon.com/exec/obidos/ISBN=123456789X" class="external" target="_blank" title="Amazon">[4]</a>
  (
 <a href="http://shop.barnesandnoble.com/bookSearch/isbnInquiry.asp?isbn=123456789X" class="external" target="_blank" title="Barnes & Noble">alternate</a>
 , 
 <a href="http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=123456789X" class="external" target="_blank" title="FatBrain">alternate</a>
 ) x20
x21 
 <a href="http://www.amazon.com/exec/obidos/ISBN=123456789x" class="external" target="_blank" title="Amazon">BookTitle</a>
  (
 <a href="http://shop.barnesandnoble.com/bookSearch/isbnInquiry.asp?isbn=123456789x" class="external" target="_blank" title="Barnes & Noble">alternate</a>
 , 
 <a href="http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=123456789x" class="external" target="_blank" title="FatBrain">alternate</a>
 ) x21
x22 
 <a href="http://www.amazon.com/exec/obidos/ISBN=123456789x" class="external" target="_blank" title="Amazon">Flowers, and why they grow</a>
  (
 <a href="http://shop.barnesandnoble.com/bookSearch/isbnInquiry.asp?isbn=123456789x" class="external" target="_blank" title="Barnes & Noble">alternate</a>
 , 
 <a href="http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=123456789x" class="external" target="_blank" title="FatBrain">alternate</a>
 ) x22
x23 [ISBN   1234567-893434343-x Flowers, and why they grow] x23
 </pre>