Pettofrezzo, Anthony J. <br/><br/>
Elements of number theory/ 
Anthony J. Pettofrezzo and Donald R. Byrkit. 
 - Englewood Cliffs, N.J.:  Prentice-Hall,  [1970]. 
 - xii, 244 p.:  24 cm. 
<br/><br/><label>ISBN: </label>0132683008 
<br/><br/><label>LCCN: </label>77081766 //r90 
<br/><br/><label>Nat. Bib. No.: </label>GB70-11068 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory.
<br/><br/><label>Dewey Class. No.: </label>512.7  / P511e