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Paul H. Elwood, Jeremy B. Albertus, editor
Nova Science Publisher, 2008
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Insor, D., author
Frederick A.Praeger, 1963
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Simanjuntak, Edward G Hasiholan, author
Sekolah Ilmu Lingkungan Universitas Indonesia, 2018
UI - Disertasi (Membership)
Savitz, Andrew W., author
Jossey-Bass, 2014
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