Ivamy, E.R. Hardy, author
Butterworth, 1983
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Mohammad Rizki Cahyadi, author
2018
UI - Skripsi (Membership)
Universitas Indonesia, 1993
UI - Skripsi (Membership)
Gunanto, author
Astoeti Gunanto & Associates, 1988
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Lubis, Meisya Andriani, author
2017
UI - Skripsi (Membership)