- Populisme in Europa (2019), a book about populism in Europe.
- Det høyrepopulistiske Norge (2017), a book about right-wing populism in Norway.
- Det store hamskiftet (2015), a book about the Norwegian Labour Party's shift to the right.
- Norske tilstander 2020 (2020), a book about the state of Norway in 2020.
- Innvandringsregulering i Europa (2012), a book about immigration regulation in Europe.
Kinnapel has also written a number of articles for newspapers and magazines, including Aftenposten, Dagsavisen, and Morgenbladet. He is also a regular guest on radio and television shows, where he discusses political and social issues.