Infinitely cern: memories of fifty years of research 1954-2004
Suzanne Hurter, 2004
 Buku Referensi
Infinitely cern : memories of fifty years of research 1954-2004
European Organization for Nuclear Research
Suzanne Hurter, 2004
 Buku Referensi
Fifty years of Indian parliament
edited by G.C. Malhotra
Lok Sabha Secretariiat, 2002.
 Buku Teks
Hazeu, H.A.G.
Fifty years of electronic components 1921-1971
N.V. Philips Gloeilampenfabrieken, 1971
 Buku Teks
Scott-James, R.A.
Fifty years of English literature 1900-1950
Longman, 1951
 Buku Teks