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Cengage Learning, 2014
Buku Teks
Sembiring, Riswanto, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2010
UI - Tesis Open
Taylor, Philip E., author
Macmillan, 1953;1948
Buku Teks
Maxwell, James C., author
Henry Helt, 1955
Buku Teks
Ilersic, A. R.
Staples Press Ltd, 1955
Buku Teks