1. Brockhaus' Konversations-Lexikon. Leipzig ; Berlin ; Wien : F.A. Brockhaus, 1898. - 3. sēj.

2. https://archive.org

3. https://www.bionity.com

4. https://www.encyclopedia.com

5. https://repository.library.northeastern.edu

6. https://www.uni-potsdam.de/de/haskala/haskala-in-biographien/bloch

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