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Sheed and Ward, 1958
Buku Teks
George, Vensus A., author
Council for Research in Values and Philosophy, 2008
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Ferm, Vergillius
Littlefield, Adams, 1961
Buku Teks
Pius Suratman, author
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UI - Tesis (Membership)
edited by Stewart Sutherland, Leslie Houlden, Peter Clarke, Friedhelm Hardy
Routledge, 1988
Buku Referensi