Corden, W. M..
The theory of protection /
W.M. Corden 
. - Oxford : Oxford University Press,  1977 
. - xiii, 263 p.  schem.  21 cm. 
<br/>К.: Бібліогр. : c. 253-258, Index 
<br/><label>  ISBN: </label>0-19-828413-6