CNH - Cappelens History of Norway, Volumes 1-15, Oslo, 1976-80.
HT - Historical Journal, Christiania/Oslo, 1871-.
KLNM - History of Culture Encyclopedia for the Nordic Middle Ages, I-XXII, Oslo, 1956-1978.
NBL - Norwegian Biographical Encyclopedia, I-XIX, Christiania/Oslo, 1923-1983.
NH - Norway's History by Andreas Holmsen, Oslo 1961.
NK - Norway's Church History by Sigurd Kolsrud, I. Middle Ages, Oslo, 1958.
NSHT - Norwegian Family History Journal, Oslo 1928-.
NU - The End of Norway's Power by O.A. Johnsen, Christiania, 1924
RA - National Archives
Söderwall - K.T. Söderwall: Dictionary of the Swedish language in the Middle Ages, Lund 1921-1952.
UB - The University Library in Oslo.
The references are always to the pages. DN I 369 or RB 572 means Diplomatarium Norvegicum
I, page 369, and The Red Book, Bishop's Eystein's Cadaster, page 572.