Walford, A. J. <br/><br/>
Walford's guide to reference material /  
edited by A. J. Walford. 
 - 4th. ed. 
 - München :   G. K. Saur,   [1980] 
 - 2 v. ;   25 cm. 
<br/><br/>Contiene: I: Science & technology. X, 697 p. -- II: Social & historical sciences, philosophy & religion... 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Obras de referencia---Bibliografías.