Froyen, Richard T. <br/><br/>
Principles of economics 
/ Richard T. Froyen 
 - London  Collier Macmillan Publishers  1990 
 - xxiv,838p. 
<br/><br/><label>ISBN: </label>0029462452 
<br/><br/><label>Dewey Class. No.: </label>330  / FRO/P