Syabas, 1994
Buku Referensi
Brunei Darussalam : Departement of Information, 2006,
Majalah, Jurnal, Buletin
Dewan Bahasa dan Pustaka Brunei, 2000
Buku Referensi
Brunei Press, 1999
Buku Referensi
Wona, T.M.
Forestry Department Ministry of Industry and Primary Resources, 1994
Buku Teks