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M., W., S., Sumardi, (2004, 2007). Dasar-dasar perlindungan hutan / Sumardi, S. M. Widyastuti (Cet.1,2). Yogyakarta: Gadjah Mada University Press.

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Widyastuti, S., M.., Sumardi, . "Dasar-dasar perlindungan hutan / Sumardi, S. M. Widyastuti". Cet.1,2 Yogyakarta: Gadjah Mada University Press, 2004, 2007. Textbook.