APA (7th ed.) Citation

Tropp, Ė. A., Dron, A., & Burov, M. (1993). Alexander A. Friedmann: The man who made the universe expand. Cambridge University Press. https://doi.org/10.1017/CBO9780511608131

Chicago Style (17th ed.) Citation

Tropp, Ė. A., Alexander Dron, and Michael Burov. Alexander A. Friedmann: The Man Who Made the Universe Expand. Cambridge: Cambridge University Press, 1993. https://doi.org/10.1017/CBO9780511608131.

MLA (9th ed.) Citation

Tropp, Ė. A., et al. Alexander A. Friedmann: The Man Who Made the Universe Expand. Cambridge University Press, 1993. https://doi.org/10.1017/CBO9780511608131.