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Buku Teks
Harpole, Greg
McGraw-Hill, 1986
Buku Teks
DeJulio, Karen
McGraw-Hill, 1986
Buku Teks
Ward, Ralph D.
John Wiley & Sons, 1997
Buku Teks
Muhammad Ardhika Zulu
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2014
UI - Skripsi Membership