Hamberg, Daniel
Little, Brown and company , 1981
Buku Teks
Mehmet Ezer
Bank Indonesia Institute, 2019
Artikel Jurnal
Woodworth, George Walter
McGraw-Hill, 1950
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Rifki Ismail
John Wiley & Sons, 2013
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Binhadi
Institut Bankir Indonesia, 1995
Buku Teks