Nigtingale, N. 1981 Ranging Behaviour Of The Proboscis Monkey In Samunsam Wildlife Sanctuary
Kavanagh, M. 1982 Lanjak Entimau Orang-Utan Sanctuary: A Management Plan
Labang, D. 1986 Report On Pest Monkeys In Bako National Park
Blouch, R.A. 1994 Densities And Distribution Of Primates In Lanjak Entimau Wildlife Sanctuary And Recommendation For Sanctuary Management
Mitchel, H.W. 1997 Preliminary Result Of A Primate Survey In Gunung Mulu National Park
Abdul Kadir Mohd. Hussain & Abu Bakar Azman B. Abdul Hamid 1999 Preliminary Report On The Orang-Utan (Pongo pygmaeus) Rehabilitation Programs At Matang Wildlife Centre