1.1. Council for Assisting Refugee Academics (CARA)
1.1.1. Website of CARA 1.1.2. Times Higher Education supplement on CARA (May 2013) 1.1.3. Nature article on CARA (October 9, 2013)
1.2. Society for the Protection of Science and Learning (SPSL)
1.2.1. Archive of the SPSL at the Bodleian Library, Oxford 1.2.2. Nature article on the SPSL 1.2.3. David Zimmerman on the SPSL (via SpringerLink) 1.2.4. Shula Marks et al.: »In Defence of Learning«
1.3. Article on the Academic Assistance Council (AAC, predecessor of the SPSL)
1.4. Esther Simpson, Secretary of the AAC
1.4.1. Obituary for Esther Simpson (December 24, 1996) 1.4.2. R. M. Cooper's book on Esther Simpson: »Retrospective Sympathetic Affection« 1.4.3. Paul Broda: »Esther Simpson - A Correspondence« 1.4.4. Cover of John Eidinow's book on Esther Simpson (Robinson 2023)
2. Widerstand in Wien
2.1. Wikipedia-Eintrag zu Herbert Steiner, Gründer des DÖW
3. Margaret Gowing, British historian
3.1. Wikipedia entry
3.2. Monograph on »Britain and Atomic Energy, 1939-1945«
4. Alan Nunn May, physicist and spy
4.1. Wikipedia entry
4.2. Paul Broda’s book »Scientist Spies«
5. Engelbert Broda's brother Christian
5.1. Wikipedia-Eintrag
5.2. Maria Wirth: »Christian Broda - eine politische Biographie«
1. CARA, SPSL, AAC, Esther Simpson 
