Cartmell, E. <br/><br/>
Valency and molecular structure / 
E. Cartmell and G.W. A Fowles 
 - 4th ed. 
 - London :  Butterworths,  1977 
 - 341 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0408708093 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Valence (Theoretical chemistry).