Cartmell, E. <br/><br/>
Valency and molecular structure 
E. Cartmell and G.W.A. Fowles 
 - 3rd ed 
 - London  The English Language Book Society and Butterworth  1970 
 - 315p. :  26cm 
<br/><br/><label>ISBN: </label>0408700386 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Valence (Theoretical chemistry).<br/>Molecules.