Worrall, Jean. <br/><br/>
Introduction to valence theory 
by Jean Worrall and I. J. Worrall. 
 - New York  American Elsevier Pub. Co.  1969. 
 - vii, 102 p.  illus.  22 cm. 
<br/><br/><label>ISBN: </label>0444197079 
<br/><br/><label>LCCN: </label>74099464 //r86 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Valence (Theoretical chemistry)
<br/><br/><label>LC Class. No.: </label>QD469  / .W67 1969 
<br/><br/><label>Dewey Class. No.: </label>541/.224