Ekman, T & Froberg, C-E <br/><br/>
Introduction to algol programming 
T. Ekman & C-E. Froberg 
 - 3 
 - London  Oxford University Press  1967 
 - 186 
<br/><br/><label>ISBN: </label>9144004435 
<br/><br/><label>Dewey Class. No.: </label>18  / EKMA