Nissen published around twenty books, and was a government scholar from 1938. His books treated a number of fundamental human questions such as sexuality, mass psychology, power hunger and the feeling of guilt. His most popular book was Psykopatenes diktatur from 1945, an effort to discuss the German catastrophe.
- Kittang, Atle. "Ingjald Nissen". In Helle, Knut (ed.). Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 15 April 2013.
- Steenstrup, Bjørn, ed. (1973). "Nissen, Ingjald". Hvem er hvem? (in Norwegian). Oslo: Aschehoug. p. 412. Retrieved 20 April 2014.
- Godal, Anne Marit (ed.). "Ingjald Nissen". Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 15 April 2013.
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