Indonesian Journal of Conservation
Badan Pengembangan Konservasi UNS,
 Majalah, Jurnal, Buletin
Mangroves for national development and conservation in Indonesia : challenges for the future
 Artikel Jurnal
Cunha, George Daniel Martin
Conservation of library materials: a manual and bibliography on the care, repair and restoration of library materials
Scarecrow Press, 1967
 Buku Teks
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