Drooyan, Irving. <br/><br/>
A programmed introduction to number systems 
[by] Irving Drooyan [and] Walter Hadel. 
 - New York,  Wiley  [1964] 
<br/><br/>Bibliography: p. 259. 
<br/><br/><label>LCCN: </label>64023188 //r932 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory -- Programmed instruction.--Number theory -- Programmed instruction.
<br/><br/><label>LC Class. No.: </label>QA241  / .D75 
<br/><br/><label>Dewey Class. No.: </label>512.8107