Ross, Ralph Gilbert,  1911- <br/><br/>
Obligation :  a social theory / 
by Ralph Ross 
 - Ann Arbor, Mich. :  University of Michigan Press,  1970 
 - 200 p. ;  22 cm. 
<br/><br/><label>ISBN: </label>0472087657 :  USD 7.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ethics<br/>Social ethics<br/>Duty
<br/><br/><label>Dewey Class. No.: </label>301