Michał Kokowski, The Science of Science (naukoznawstwo) in Poland: Defending and Removing the Past in the Cold War. As chapter 7 in: Science Studies during the Cold War and Beyond. Paradigms Defected. Edited by Elena Aronova, Simone Turchetti. Palgrave Macmillan, 2016. “Palgrave Studies in the History of Science and Technology”, pp. 149–176. DOI: 10.1057/978-1-137-55943-2_7; here p. 149: "some Polish contributors to science of science (Kazimierz Twardowski, Maria Ossowska, Stanisław Ossowski, Tadeusz Kotarbiński, Kazimierz Ajdukiewicz, Florian Znaniecki, Ludwik Fleck, Stefan Amsterdamski) have gained international recognition."