Gaya APA
Hutapea, J, R. (1992).
Management and Conservation of Tropical Forest Ecosystems and Biodiversity .
Tawangmangu:
alai Penelitian Tanaman Obat Badan Penelitian dan Pengembangan Kesehatan.
Gaya MLA
Hutapea, Johnny, Ria.
"Management and Conservation of Tropical Forest Ecosystems and Biodiversity".
Tawangmangu:
alai Penelitian Tanaman Obat Badan Penelitian dan Pengembangan Kesehatan,
1992.
print.