Walford's concise guide to reference material : second edition
edited by Anthony Chalcraft [and others]
Library Association, 1992
 Buku Referensi
Walford's guide to reference material : fifth edition, volume 1, science and technology
Library Association, 1989
 Buku Referensi
Walford's guide to reference material : fourth edition, volume 3, generalia, languages & literature, the arts / edited by A.J. Walford and L.J. Taylor
Library Association, 1987
 Buku Referensi
Walford's guide to reference material : sixth edition, volume 2, social & historical sciences, philosophy & religion
Library Association Publishing, 1994
 Buku Referensi
Walford`s guide to reference material : fourth edition, volume 2, social & historical sciences, philosophy & religion
Library Association, 1982
 Buku Referensi