The official Ubuntu book / 
Benjamin Mako Hill ... [et al.]. 
 - 6th ed. 
 - Upper Saddle River, NJ :  Prentice Hall,  c2011. 
 - xxxviii, 378 p. :  ill. ;  24 cm. +  1 DVD-ROM (4 3/4 in.) 
<br/><br/> "UBUNTU 11.04: desktop edition"--On disc label. 
<br/><br/><label>ISBN: </label>9780132748506 (pbk.)   RM 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Ubuntu (Electronic resource).<br/>Linux.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems (Computers).