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Gaya APA
Wirakusumah, R.(1980).Cita dan Fenomena Hutan Tropika Humida Kalimantan Timur .Indonesia:.
Gaya MLA
Wirakusumah, R.Sambas."Cita dan Fenomena Hutan Tropika Humida Kalimantan Timur".Indonesia:,1980.Text.