Fifty years among the new words : a dictionary of neologisms, 1941-1991
edited by John Algeo
Cambridge University Press, 1993
 Buku Referensi
Hwok-Aun Lee, author
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., author
Fifty years of electronic components 1921-1971
N.V. Philips Gloeilampenfabrieken, 1971
 Buku Teks
Scott-James, R.A., author
Fifty years of English literature 1900-1950
Longman, 1951
 Buku Teks
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