Johannsen, W. (1905). Arvelighedslærens elementer ("The Elements of Heredity". Copenhagen). Rewritten, enlarged and translated into German as Elemente der exakten Erblichkeitslehre (Jena: Gustav Fischer, 1909; Scanned full text. (页面存档备份,存于互联网档案馆)
Johannsen, W. (1905). Arvelighedslærens elementer ("The Elements of Heredity". Copenhagen). Rewritten, enlarged and translated into German as Elemente der exakten Erblichkeitslehre (Jena: Gustav Fischer, 1909; Scanned full text. (页面存档备份,存于互联网档案馆)