Grotta, Daniel, 1944-
J.R.R. Tolkien : architect of Middle Earth; a biography
Running Press, 2002
Buku Teks
Armstrong, Karen
Muhammad, a biography of the Prophet
Phoenix, 1991
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Slauerhoff, J
Amsterdam : De Bezige Bij, 1965
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Sobolev, Leonid
Big Refit
Moscow : Progress Publishers, 1965
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Rogg, S.G.
Emotion and the job / S.G. Rogg.
Charles C. Thomas, 1965
Buku Teks SO