1. Nordic Council, Printed records from annual sessions for the years 1957, 1959, 1962–1964, 1966.
2. Norwegian Parliament, Records from the 104. Proceedings (1959–60), “20 jan. – Interp. fra repr. Engan om utbygging av vegforbindelsen mellom Nordland fylke og Sverige” [“20 January, Interpellation from MP Engan on the road link between Nordland county and Sweden”].
3. Norwegian Parliament, Records from the 106. Proceedings (1961–62), 14. mars. – “Spm. Fra. Repr. Leirfall om mellomriksvegen over Graddis” [“14 March, Question from MP Leirfall concerning the transnational road through Graddis”], 2406–7.