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"Külad" (in Estonian). Palupera vald. Archived from the original on 19 August 2018. Retrieved 30 May 2011.
"Kaarna, Kristjan"(PDF). Eesti ajakirjanduse biograafiline leksikon 1689–1940 (in Estonian). 1 December 2015. Archived from the original(PDF) on 21 March 2019. Retrieved 29 December 2021.