A treasure at the base of the Old Aker Church, En skatt ved foten av Gamle Aker kirke, University of Oslo,存档副本. [2015-01-17]. (原始内容存档于2007-01-14)., (Norwegian)
A treasure at the base of the Old Aker Church, En skatt ved foten av Gamle Aker kirke, University of Oslo,存档副本. [2015-01-17]. (原始内容存档于2007-01-14)., (Norwegian)