Indonesian Journal of Conservation
Badan Pengembangan Konservasi UNS,
 Majalah, Jurnal, Buletin
Panjaitan, Pohan
Determination the location and size of each zona of regional water conservation area in central tapanuli distric / Pohan Panjaitan
Universitas HKBP Nonmensen, 2016
 Artikel Jurnal
Spellerberg, Ian F.
Biological conservation
Cambridge University Press, 1992
 Buku Teks
An introduction to primate conservation
edited by Serge A. Wich, Andrew J. Marshall
Oxford University Press, 2016
 eBooks
Abrol, Dharam P.
Pollination biology: biodiversity conservation and agricultural production
[, Springer], 2012
 eBooks