"Katarinan Historia" [Katarina History] (in Finnish). Ravintolalaiva Katarina. Archived from the original on 5 November 2017. Retrieved 5 November 2017.
skargardsbatar.se
"Fredriksborg" (in Swedish). skargardsbatar.se. Archived from the original on 4 November 2017. Retrieved 4 November 2017.
"Katarinan Historia" [Katarina History] (in Finnish). Ravintolalaiva Katarina. Archived from the original on 5 November 2017. Retrieved 5 November 2017.