"Penck, Walther".
Deutsche Biographische Enzyklopädie Online, edited by Rudolf Vierhaus. Berlin, New York: K. G. Saur, 2011.
https://www.degruyterbrill.com/database/DBE/entry/dbe.7-6394/html. Accessed 2026-05-06.
(2011). Penck, Walther. In R. Vierhaus (Ed.),
Deutsche Biographische Enzyklopädie Online. Berlin, New York: K. G. Saur.
https://www.degruyterbrill.com/database/DBE/entry/dbe.7-6394/html
2011. Penck, Walther. In: Vierhaus, R. ed.
Deutsche Biographische Enzyklopädie Online [online]. Berlin, New York: K. G. Saur. Available from:
https://www.degruyterbrill.com/database/DBE/entry/dbe.7-6394/html. [Accessed 2026-05-06]
"Penck, Walther" In
Deutsche Biographische Enzyklopädie Online edited by Rudolf Vierhaus. Berlin, New York: K. G. Saur, 2011.
https://www.degruyterbrill.com/database/DBE/entry/dbe.7-6394/html
Penck, Walther. In: Vierhaus R (ed.)
Deutsche Biographische Enzyklopädie Online. Berlin, New York: K. G. Saur; 2011. Available from:
https://www.degruyterbrill.com/database/DBE/entry/dbe.7-6394/html [Accessed 6 May 2026].
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