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Dryden Press, 1972
Buku Teks
Federal Reserve of Richmond, 1986
Buku Teks
Saverianus P., author
Fakultas Teknik Universitas Indonesia, 2002
UI - Skripsi (Membership)
Bain, A.D., author
Penguin Books, 1970
Buku Teks
Rose, Peter S., author
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Buku Teks