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W.W. Norton & Co., 1951
Buku Teks
Schoenberg, I.J., author
Society for Industrial and Applied Mathematics, 1993
eBooks
Muhammad Sany Ustman, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2016
UI - Skripsi Membership
Manimala, Varghese
Council for Research in Values and Philosophy , 2008
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Berman, Howard J.
The University of Mincigan, 1982
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