Walford's concise guide to reference material

Walford's guide to reference material : fifth edition, volume 1, science and technology

Walford's guide to reference material : fourth edition, volume 3, generalia, languages & literature, the arts / edited by A.J. Walford and L.J. Taylor

Walford's guide to reference material : sixth edition, volume 2, social & historical sciences, philosophy & religion

Walford`s guide to reference material : fourth edition, volume 2, social & historical sciences, philosophy & religion