Kumar, Krishan, author
Blackwell, 1996
Buku Teks
Dwi Hergiawan, author
Universitas Indonesia, 1999
UI - Skripsi (Membership)
Manimala, Varghese
Council for Research in Values and Philosophy , 2008
Buku Teks
Lubis, S.B. Hari, author
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Buku Teks
Hardy, Thomas, 1840-1928, author
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Buku Teks