Ankori, Zvi
Karaites in Byzantium : the formative years, 970-1100
Columbia University Press, 1959
 Buku Teks SO
Burns, Russell W.
The struggle for unity: colour television, the formative years
Institution of Engineering and Technology, 2008
 eBooks
Bridges, Daisy Caroline
A history of the international council of nurses 1899-1964: the first sixty-five years
Pitman medical publishing, 1967
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Baker, Geoffrey H.
Le Corbusier, the creative search : the formative years of Charles-Edouard Jeanneret
E&FN Spon, 1996
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Laue, Theodore H. Von
Leopold ranke : the formative years / Theodore H. von Laue
Princeton University Press, 1950
 Buku Teks SO