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VS Research, 2012
eBooks
edited by Leo Goedegebuure ... [and others]
Pergamon Press, 1994
Buku Teks
Quality management unit University of Sumatera Utara, 2010
Buku Teks
Amanda Citrakusuma, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis (Membership)
Universitas Indonesia, 2003
Buku Teks