Refsnes, Hege; Refsnes, Ståle; Refsnes, Jan Egil. "About Refsnes Data". W3Schools. Refsnes Data. Archived from the original on 2009-04-21. Retrieved 2018-09-09.
Refsnes, Hege; Refsnes, Ståle; Refsnes, Jan Egil. "About Refsnes Data". W3Schools. Refsnes Data. Archived from the original on 2009-04-21. Retrieved 2018-09-09.