Research Bulletin 92/  Problem Solving and Constitution of Knowledge at work. 
Juan Carlos Llorente. 
 - Helsinki:  Department of education University of Helsinki,  c1996. 
 - ill.;275p.  20x15cm. 
<br/><br/><label>ISBN: </label>951-45-7278-5 
<br/><br/><label>Dewey Class. No.: </label>153.4 CAR