TY  - BOOK
AU  - Walford,A.J.
ED  - Library Association.
TI  - Walford's concise guide to reference material / 
PY  - 1981///]
CY  - London : 
PB  - The Library Association, 
KW  - Obras de referencia-
KW  - Bibliografías
N1  - Contiene: I: Science & technology. X, 697 p. -- II: Social & historical sciences, philosophy & religion
ER  -