Roberto Ulloa <br/><br/>
Kivy: Interactive Applications in Python. 

 - 138. 
<br/><br/>Electronic book text. 
<br/><br/><br/>Data in extended ASCII character set. <br/>Mode of access: Internet. 
<br/><br/><label>ISBN: </label>9781783281602 
<br/><br/><label>Standard No.: </label>9781783281602  isbn