Otterspeer, Willem
The Bastion of Liberty: Leiden University today and yesterday
Leiden University Press, 2008
 Buku Teks SO
Kampung boy: yesterday & today
Berita Publishing Sdn Bhd, 1993
 Buku Referensi
Africa yesterday and today
Praeger Publishers, 1968
 Buku Teks SO
Africa yesterday and today
edited by Clark D. Moore and Ann Dunbar
Bantam Books, 1968
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Ahuja, B.N.
Communications yesterday, today and tomorrow
Surjeet Publications, 1989
 Buku Teks SO