https://www.tni.org/files/publication-downloads/marketforces-report-tni-statewatch.pdf
https://files.taxfoundation.org/20211014170634/International-Tax-Competitiveness-Index-2021.pdf
https://vuosikirja.supo.fi/documents/62399122/66519032/SUPO+Yearbook+2022.pdf/109369e6-13c3-ee60-474e-eff9c4d44217/SUPO+Yearbook+2022.pdf?t=1679642311270
http://www.economics-ejournal.org/economics/journalarticles/2017-10