GRACZYK, Konrad. Marian Małecki, “From under the Blade of the Guillotine. The Criminal Trial for Espionage in the Third Reich in the Light of the Files Concerning Gertrude Spruce and the U-2 Group of the Home Army”. Zabrze—Tarn. Góry, Inforteditions Publ. House, 2019. [journal closed], [S. l.], v. 13, p. 425—430, 2020. DOI: 10.31261/ZDP.2020.20.29. Disponível em: https://journals.us.edu.pl/index.php/zdp/article/view/12163. Acesso em: 10 nov. 2026.