Hwok-Aun Lee
Malaysia’s new economic policy: Fifty years of polarization and impasse
Nakanishi Printing Company, 2022
 Artikel Jurnal
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
Dixit, J.N. (Jyotindra Nath), 1936-2005
Across borders : fifty years of India's foreign policy
Picus Books, 1998
 Buku Teks