Speakman, J. C. <br/><br/>
A valency primer 
by J. C. Speakman 
 - London  Edward Arnold  1968 
 - 112 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0713121831 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Valence (Theoretical chemistry).<br/>Molecular structure.