PAJU, P. Carl Robert Mannerheim teknologiayrittäjänä. Tekniikan Waiheita – the Finnish quarterly for the history of technology, [S. l.], v. 28, n. 1, p. 16–27, 2010. Disponível em: https://journal.fi/tekniikanwaiheita/article/view/63946. Acesso em: 19 may. 2024.