Duiker, William J. <br/><br/>
Essential world history / 
by William J. Duiker and Jackson J. Spielvogel 
 - 6th ed. 
 - Australia :  Wadsworth Cengage Learning,  2011. 
<br/><br/><label>ISBN: </label>9780495902942 
<br/><br/><label>Subjects--Index Terms: </label>World history