Carl Wilhelm Erich Zimmer (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Carl Wilhelm Erich Zimmer" in English language version.

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books.google.com

Thies - Zymalkowski / edited by Rudolf Vierhaus Deutsche Biographische Enzyklopaedie.
Lexikon deutschsprachiger Bryologen, Volume 1 by Jan-Peter Frahm, Jens Eggers.

Beolens, Bo; Watkins, Michael; Grayson, Michael (2013). The Eponym Dictionary of Amphibians. Exeter, England: Pelagic Publishing. p. 240. ISBN 978-1-907807-42-8.