R. Ardi

A preliminary assessment of using conservation drones for Sumatran orang-utan (Pongo abelii) distribution and density

S. Wich, L. P. Koh, D. Dellatore, 2016 .

Plant diversity, structure and composition of vegetation around Barumun Watershed, North Sumatra, Indonesia

O. Onrizal, R. Ardi, A. Susilowati, 2021, Biodiversitas Journal of Biological Diversity.

Land-cover changes predict steep declines for the Sumatran orangutan (Pongo abelii)

Hjalmar S. Kühl, Serge A. Wich, Matthew G. Nowak, 2016, Science Advances.