Tvedt, Knut Are (ed.). "Majorstua". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 11 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Hovseter". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 1 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Røa". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Eiksmarka". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Østerås". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
trafikanten.no
"Rutetider"(PDF) (in Norwegian). Ruter. Archived(PDF) from the original on 22 July 2011. Retrieved 21 October 2010.
web.archive.org
Tvedt, Knut Are (ed.). "Majorstua". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 11 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Hovseter". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 1 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Røa". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Eiksmarka". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
Tvedt, Knut Are (ed.). "Østerås". Store Norske Leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Archived from the original on 23 October 2012. Retrieved 21 October 2010.
"Rutetider"(PDF) (in Norwegian). Ruter. Archived(PDF) from the original on 22 July 2011. Retrieved 21 October 2010.