Ellis, David
Library Association Publishing, 1996
Buku Teks
Hill, Norman
Harper & Brothers, 1952
Buku Teks
Colm, Gerhard
National Planning Association , 1961
Buku Teks
edited by Gordon Mclachlan
Nuffield Provincial Hospital Trust, 1972
Buku Teks
edited by Gordon Mclachlan
Oxford University Press, 1970
Buku Teks