Article Ulett, Mark A.; (2014)
Making the Case for Orthogenesis: The Popularization of Definitely Directed Evolution (1890--1926)

Thesis Ulett, Mark Andrew; (2014)
Definitely Directed Evolution (1890--1926): The Importance of Variation in Major Evolutionary Works by Theodor Eimer, Edward Drinker Cope, and Leo Berg

Thesis Brinkman, Paul David; (2005)
The Second American Jurassic Dinosaur Rush, 1895--1905

Article Kate MacCord; (2019)
The Impacts of Assumptions on Theories of Tooth Development and Evolution at the Turn of the Nineteenth Century

Article David Ceccarelli; (2019)
Between Social and Biological Heredity: Cope and Baldwin on Evolution, Inheritance, and Mind

Article James R. Jackson; Aleta Quinn; (2023)
Post-Darwinian fish classifications: Theories and methodologies of Günther, Cope, and Gill

Article David Ceccarelli; (2021)
Theistic evolution and evolutionary ethics: Henry Fairfield Osborn and Huxley’s legacy

Book Regal, Brian; (2002)
Henry Fairfield Osborn: Race and the Search for the Origins of Man

Book Loison, Laurent; (2010)
Qu'est-ce que le néolamarckisme? Les biologistes français et la question de l'évolution des espèces, 1870--1940

Article Loison, Laurent; (2012)
Le projet du néolamarckisme français (1880--1910)

Article Sullivan, Gregory; (2011)
The Instinctual Nation-State: Non-Darwinian Theories, State Science and Ultra-Nationalism in Oka Asajiro's Evolution and Human Life

Chapter Loison, Laurent; (2011)
The Notions of Plasticity and Heredity among French Neo-Lamarckians (1880--1940): From Complementarity to Incompatibility

Book Loison, Laurent; Morange, Michel; (2010)
Qu'est-ce que le néolamarckisme? Les biologistes français et la question de l'évolution des espèces: 1870--1940

Article Bowler, Peter J.; (1979)
Theodor Eimer and orthogenesis: Evolution by “definitely directed variation”

Essay Review Hopwood, Nick; (2009)
Darwinism's Tragic Genius: Psychology and Reputation

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

Article Kyriakou, Kyriakos; Skordoulis, Constantine; (2010)
The Reception of Ernest Haeckel's Ideas in Greece

Essay Review Radick, Gregory; (2009)
[Essay review]

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

Chapter Wells, Jonathan; (2003)
Haeckel's Embryos and Evolution: Setting the Record Straight