Girling,D A. <br/><br/>
Everyman's encyclopaedia,Vol.11 

 - 6th ed. 
 - London  J M Dent & sons Ltd.  1978 
 - 764p. 
<br/><br/><label>ISBN: </label>0460040235 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sextant- Tracheid
<br/><br/><label>Dewey Class. No.: </label>032  / GIR/E.11