Erik Westra <br/><br/>
Modular Programming with Python. 

 - 246. 
<br/><br/>Electronic book text. 
<br/><br/><br/>Data in extended ASCII character set. <br/>Mode of access: Internet. 
<br/><br/><label>ISBN: </label>9781785887673 
<br/><br/><label>Standard No.: </label>9781785887673  isbn