Pauli Heikkilä, Estonians for Europe. National Activism for European Unification 1922-1991. Zeitschrift für Ostmitteleuropa-Forschung, [S. l.], v. 65, n. 2, p. 296–298, 2016. DOI: 10.25627/201665210032. Disponível em: https://openjournals.osmikon.de/zfo/article/view/10032. Acesso em: 16 sep. 2026.