Pauli, Gunter
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Buku Teks
edited by Ann Mattis
Duke University Press in collaboration with the Society for International Development, 1983
Buku Teks
Lewis, William Arthur, 1915-
George Allen & Unwin, 1951
Buku Teks
Baumol, William J.
Macmillan, 1959
Buku Klasik
Kunkel, John H.
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Buku Teks SO