Chapter Schröder, Iris; (2006)
Das Leipziger Kränzchen, die Anthropogeographie und die Kunst: Zu Friedrich Ratzels Versuchen, die Erdkunde zu verallgemeinern (/isis/citation/CBB001021530/) unapi

Article Stefan Wogawa; (2020)
„Sofort reiste ich nach Jena“ Die gescheiterte Promotion von Karl Kautsky bei Ernst Haeckel (/isis/citation/CBB800671190/) unapi

Thesis Wellner, Karen L.; (2014)
Lessons from Embryos: Haeckel's Embryo Drawings, Evolution, and Secondary Biology Textbooks (/isis/citation/CBB001567645/) unapi

Book Roman Göbel; Gerhard Müller; Claudia Taszus; (2019)
Ernst Haeckel: Ausgewählte Briefwechsel, Band 2: Familienkorrespondenz, August 1854 bis März 1857 [Selected Correspondence, Volume 2: Family Correspondence, Augst 1854 to March 1857] (/isis/citation/CBB349269740/) unapi

Article Ludwig, David; (2013)
Mediating Objects: Scientific and Public Functions of Models in Nineteenth-Century Biology (/isis/citation/CBB001320174/) unapi

Article Richards, Robert J.; (2005)
Ernst Haeckel and the Struggles over Evolution and Religion (/isis/citation/CBB000933659/) unapi

Chapter Morton, Marsha; (2009)
From Monera to Man: Ernst Haeckel, Darwinismus, and Nineteenth-Century German Art (/isis/citation/CBB001035101/) unapi

Article Kleeberg, Bernhard; (2007)
God-Nature Progressing: Natural Theology in German Monism (/isis/citation/CBB000850279/) unapi

Thesis Gliboff, Sander Joel; (2001)
The pebble and the planet: Paul Kammerer, Ernst Haeckel, and the meaning of Darwinism (/isis/citation/CBB001562605/) unapi

Chapter Gregory, Frederick; (2012)
Proto-Monism in German Philosophy, Theology, and Science, 1800--1845 (/isis/citation/CBB001201835/) unapi

Article Reynolds, Andrew; (2008)
Ernst Haeckel and the Theory of the Cell State: Remarks on the History of a Bio-Political Metaphor (/isis/citation/CBB000931532/) unapi

Book Kleeberg, Bernhard; (2005)
Theophysis: Ernst Haeckels Philosophie des Naturganzen (/isis/citation/CBB000830695/) unapi

Article Hopwood, Nick; (2015)
The Cult of Amphioxus in German Darwinism; or, Our Gelatinous Ancestors in Naples' Blue and Balmy Bay (/isis/citation/CBB001510262/) unapi

Book Zigman, Peter; (2000)
Einblicke in eine sterbende Ära: Das Ende des Mythos der guten alten Zeiten (/isis/citation/CBB000102643/) unapi

Thesis Andrea Wald; (2015)
Ornament. Eine österreichische Befindlichkeit (/isis/citation/CBB012450814/) unapi

Article Wegener, Daan; (2011)
“Das politische Welträtsel”: Ernst Haeckel en het Duitse liberalisme 1859--1900 (/isis/citation/CBB001251338/) unapi

Book Gliboff, Sander; (2008)
H. G. Bronn, Ernst Haeckel, and the Origins of German Darwinism: A Study in Translation and Transformation (/isis/citation/CBB000850350/) unapi

Article Hoßfeld, Uwe; Breidbach, Olaf; (2005)
In the Wake of the “Darwin Correspondence”. 40.000 Letters to Ernst Haeckel Listed and Available for Study (/isis/citation/CBB000933656/) unapi

Article Nöthlich, Rosemarie; Wetzel, Nadine; Hoßfeld, Uwe; Olsson, Lennart; (2006)
“Ich acquirirte das Schwein sofort, ließ nach dem Niederstechen die Pfoten abhacken u. schickte dieselben an Darwin”---Der Briefwechsel von Otto Zacharias mit Ernst Haeckel (1874--1898) (/isis/citation/CBB000933670/) unapi

Article Müller, Gerhard H.; (1992)
Ratzel et la biogéographie en Allemagne dans la deuxième moitié du XIXe siècle (/isis/citation/CBB000029623/) unapi