Yusuf Wibisono, author
Gajah Mada University Press, 2005
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Badan Pusat Statistik, 2018
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Pasaribu, Amudi, author
Ghalia Indonesia , 1981
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I.A. Supranto, author
Rajawali, 1983
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Pasaribu, Amudi, author
Ghalia Indonesia, 1983
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