Chapter Di Gregorio, Mario A.; (2009)
Unter Darwins Flagge: Ernst Haeckel, Carl Gegenbaur und die Evolutionäre Morphologie (/isis/citation/CBB001035236/)

Chapter Krausse, Erika; (1994)
Zum Verhältnis von Carl Gegenbauer (1826-1903) und Ernst Haeckel (1834-1919): Generelle und spezielle Morphologie (/isis/citation/CBB000064428/)

Article Di Gregorio, Mario A.; (1995)
A wolf in sheep's clothing: Carl Gegenbaur, Ernst Haeckel, the vertebral theory of the skull, and the survival of Richard Owen (/isis/citation/CBB000060555/)

Article Olivier Rieppel; (2020)
Morphology and Phylogeny (/isis/citation/CBB122827069/)

Article Fröber, Rosemarie; (2003)
The Anatomical Collection in Jena and the Influence of Carl Gegenbaur (/isis/citation/CBB000430233/)

Article Laubichler, Manfred D.; Maienschein, Jane; (2003)
Ontogeny, Anatomy, and the Problem of Homology: Carl Gegenbaur and the American Tradition of Cell Lineage Studies (/isis/citation/CBB000430236/)

Article Hoßfeld, Uwe; Olsson, Lennart; Breidbach, Olaf; (2003)
Carl Gegenbaur (1826--1903) and His Influence on the Development of Evolutionary Morphology (/isis/citation/CBB000430229/)

Article Coleman, William; (1976)
Morphology between type concept and descent theory (/isis/citation/CBB000011614/)

Article Mollenhauer, Dieter; (1980)
Die Haeckel-Rezeption durch die Botanik (/isis/citation/CBB000000794/)

Book Gregorio, Mario A. di; (2005)
From Here to Eternity: Ernst Haeckel and Scientific Faith (/isis/citation/CBB000671261/)

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/)

Article Maurizio Esposito; (2020)
Beyond Haeckel’s Law: Walter Garstang and the Evolutionary Biology that Might Have Been (/isis/citation/CBB981325352/)

Article Jahn, Ilse; (1985)
Ernst Haeckel und die Berliner Zoologen: Eine Auswahl aus seinem Briefwechsel mit Eduard von Martens, Wilhelm Peters und Karl Möbius (/isis/citation/CBB000058837/)

Chapter Fangerau, Heiner; (2012)
Monism, Racial Hygiene, and National Socialism (/isis/citation/CBB001201843/)

Article Henning Hufnagel; Nick Hopwood; Frank Jäger; Nicolas Wanlin; (2016)
Kreatives Kopieren: Ernst Haeckels Embryonenbilder (/isis/citation/CBB488755501/)

Book Keiko Sato; (2015)
Hekkeru to shinka no fantaji: Ichigenron, ekoroji, keitouju ヘッケルと進化の夢:一元論,エコロジー,系統樹 Haeckel and the Fantasy of Evolution: Monism, Ecology, and the Genealogical Tree (/isis/citation/CBB052999110/)

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

Book Rosemarie Nöthlich, Christoph Kockerbeck; (2006)
Ernst Haeckel -- Wilhelm Bölsche: Kommentarband zum Briefwechsel 1887--1919 (/isis/citation/CBB000610120/)

Article Brain, Robert Michael; (2010)
How Edvard Munch and August Strindberg Contracted Protoplasmania: Memory, Synesthesia, and the Vibratory Organism in Fin-de-Siècle Europe (/isis/citation/CBB001031062/)

Article Zigman, Peter M.; (2009)
“ ... und meine Anschauungen sind natürlich selbständiger geworden” -- Friedrich Ratzels Briefe an Ernst Haeckel, seinen Mentor und akademischen Kollegen (/isis/citation/CBB001032286/)