Berube, David. <br/><br/>
Practical Ruby Gems  [electronic resource] / 
by David Berube. 
 - Berkeley, CA :  Springer  2007. 
 - 271 p. :  ill., digital ;  23 cm. 
<br/><br/><label>ISBN: </label>9781430201939 (electronic bk.) 
<br/><br/><label>LC Class. No.: </label>QA76.64  / .B478 2007 
<br/><br/><label>Dewey Class. No.: </label>005.133