Polonsky, A. (2020). Sir Sigmund Sternberg: 2 June 1921-18 October 2016. Polin.
Cita Chicago (17th ed.)Polonsky, Antony. "Sir Sigmund Sternberg: 2 June 1921-18 October 2016." Polin 2020.
Cita MLA (8th ed.)Polonsky, Antony. "Sir Sigmund Sternberg: 2 June 1921-18 October 2016." Polin, 2020.
Atenció: Aquestes cites poden no estar 100% correctes.