N. J. E. Austin; N. B. Rankov <br/><br/>
Exploratio  Military & Political Intelligence in the Roman World from the Second Punic War to the Battle of Adrianople 

 -  Taylor and Francis  1996 
<br/><br/><label>ISBN: </label>9780203033050 
<br/><br/><label>Source: </label>EBOOK