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Buku Teks
Ronald, Dana M.
John Wiley & Sons, 1987
Buku Teks
Khaerunnisah
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Skripsi (Membership)
edited by Cynthia Jeffrey
Emerald, 2016
eBooks
South-Western Pub. Co.,, 1992
Buku Teks