Sugiyono, author
Alfabeta, 1999
Buku Teks
Kiyosaki, Robert T., 1947-, author
Gramedia Pustaka Utama, 2005
Buku Teks
Herman Soeparma, author
Fakultas Teknik Universitas Indonesia, 2008
UI - Tesis (Open)
Douglas, Lloyd V.
Prentice-Hall, 1965
Buku Teks
Carlile, Paul R., author
Emerald, 2016
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