Arithmetic and Algebra / 
Proga Rosanne  
 - 3rd ed. 
 - Boston :  PWS Publishing Company ,  1992 
 - xii , 586 p.  28 cm. 
<br/><br/><label>ISBN: </label>0534929974 
<br/><br/><label>LC Class. No.: </label>QA107  / .P76  1992