1. Pope Alexander III. Letter to the King of Norway and the Archbishop of Nidaros, (1170),1898
2. Ibid 18 557 560
3. New Chemical Researches in Cod-Liver Oil;Heyerdahl,1895
4. Umettede fettsyrer i var ernaring og i blodet. Ttdsskr. Kjemi;Notevarp;Bergv. og Met.,1960