Whittaker, C. R..
Frontiers of the Roman Empire: a social and economic study /
C.R. Whittaker 
. - Baltimore : London : Johns Hopkins University Press,  1994 
. - xvi, 341 p.  ill., map.  23 cm. 
 - (Ancient society and history )
<br/>К.: Бібліогр. : с. 307-330, Покажчик 
<br/><label>  ISBN: </label>0-8018-4677-3