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eBooks
edited by Yiorgos Apostolopoulos, Stella Leivadi and Andrew Yiannakis
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Buku Teks
Riznaldi Akbar
Buiness School Universitas Pelita Harapan,
Artikel Jurnal
Fadlinnisa
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2013
UI - Tugas Akhir
John Wiley & Sons, 1977
Buku Teks