Henry, Richard (28 July 2000). "Norbert Capek". Dictionary of Unitarian & Universalist Biography. Archived from the original on 12 October 2022. Retrieved 12 May 2023.
Henry, Richard (28 July 2000). "Norbert Capek". Dictionary of Unitarian & Universalist Biography. Archived from the original on 12 October 2022. Retrieved 12 May 2023.