Westermann, William Linn 1873-1954.
The slave systems of Greek and Roman antiquity /
William L. Westermann 
. - Philadelphia : American Philosophical Society,  1955 
. - xii, 180 p.  31 cm. 
 - (Memoirs of the American Philosophical Society  ; v. 40 )
<br/>К.: Бібліогр. : c. 163-173, Index 
<br/><label>  ISBN: </label>0-87169-040-3