1. Physics and Beyond: Encounters and Conversations;Heisenberg,1971
2. Niels Bohr’s Times, In Physics, Philosophy, and Polity;Pais,1991
3. Gravitation;Misner,1973
4. A. Einstein, Kosmologische Betrachtungen zur allgemeinen Relativitätstheorie, Sitz. Preuss. Akad. Wiss (1917) 142-152. URL:
5. English translation: Cosmological considerations on the general theory of relativity, in: H.A. Lorentz et al., The Principle of Relativity, Dover, New York, 1952, pp. 177-188.