Tallroth-Kock, Lena; Santanen, Pekka (10 August 2014). "Berndt Katter". hs.fi (in Finnish). Helsingin Sanomat. Archived from the original on 12 August 2014. Retrieved 11 August 2014.
Tallroth-Kock, Lena; Santanen, Pekka (10 August 2014). "Berndt Katter". hs.fi (in Finnish). Helsingin Sanomat. Archived from the original on 12 August 2014. Retrieved 11 August 2014.