Guide to reference material / Edited by A. J. Walford. - London : New York, N.Y. : Library Association ; Distributed in the U.S.A. by R.R. Bowker, 1959-1977. - viii, 543 p. ; 26 cm. Editor: 1959-1977 A.J. Walford. Includes indexes. Subjects--Topical Terms: Reference books--Bibliography. Dewey Class. No.: 025.52 / GUI 1961