RIKKINEN, K.; TIITTA, A. H. G. Porthan and the promotion of Finnish geography. Fennia - International Journal of Geography, [S. l.], v. 173, n. 2, p. 69–90, 1995. Disponível em: https://fennia.journal.fi/article/view/8909. Acesso em: 10 may. 2024.