… ) For a fuller list of works of and about Haeckel, see his entry in the German Wikisource . ^ "Haeckel" . Merriam-Webster.com Dictionary . Merriam-Webster. OCLC 1032680871 . ^ Ernst Haeckel at the Encyclopædia Britannica ^ Haeckel, Ernst (1866). Generelle Morphologie der Organis…