Vensus A.George
The council for reserch in values and philosophy, 2001
Buku Teks SO
Deussen, Paul, 1845-1919
Grafton Press, 1927
Buku Teks SO
Benoît, Hubert
International Specialized Book, 1955
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Guyader, Josseline
Press Universitaires de France, 1993
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Trofimenko, Genrikh
Progress Publishers, 1986
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