Armstrong, Michael
Crest Publishing House, 1999
Buku Teks SO
Armstrong, Michael
Gramedia, 2003
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Wibowo
RajaGrafindo Persada, 2012
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Tennyson, Ros
Indonesia Business Links, 2001
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Muhammad Ezra Arrazaq Irvan
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2023
UI - Tugas Akhir