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Buku Teks SO
Sampson, Anthony
Coronet Books, 1982
Buku Teks
Smith, Roy C.
Oxford University Press, 1997
Buku Teks
Canals, Jordi
Oxford University Press , 1997
Buku Teks
Syadif Ammar Taufik
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Skripsi Membership