Siegfried Popper (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Siegfried Popper" in Italian language version.

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archive.org

Poluhowich 1999, p. 99. (EN) John Poluhowich, Argonaut: The Submarine Legacy of Simon Lake, Roma, Texas A&M University Press, 1999.

Jewish Encyclopedia. Isidore Singer e Frederick T. Haneman, POPPER, SIEGFRIED, su Jewish Encyclopedia.