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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.