Kubler, George <br/><br/>
An aztec calendar of 20,176 non-repeating years in codex Borbonicus, p :  21-22 

<br/><br/>bibliogr. p. 130-131 
<br/><br/><label>ISBN: </label>3786113122 
<br/><br/><label>ISSN: </label>03418642