Nasution, Anwar, author
UNU World Institute for Development Economics Research, 1996
Buku Teks
Hamberg, Daniel, author
Little, Brown and company , 1981
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Mehmet Ezer, author
Bank Indonesia Institute, 2019
Artikel Jurnal
Woodworth, George Walter, author
McGraw-Hill, 1950
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Rifki Ismail, author
John Wiley & Sons, 2013
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