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
Celebrating indonesia : fifty years with the ford foundation 1953-2003
Ford foundation , 2003
 Buku Referensi
1957-2007 chronicle of Malaysia: fifty years of headline news
edited by Philip Mathews
Didier Millet, 2007
 Buku Referensi