ZBOROWSKA, N. Fotoamator: Piotr Śpiewla (1905–1978). Annales Universitatis Paedagogicae Cracoviensis | Studia de Cultura, [S. l.], v. 3, p. 112–126, 2014. Disponível em: https://studiadecultura.uken.krakow.pl/article/view/1566. Acesso em: 21 lis. 2024.