…controversial thinkers of his time. ^ a b c d "Ernst Haeckel" (article), German Wikipedia , 26 Oktober 2006, webpage: DE-Wiki-Ernst-Haeckel : last paragraph of "Leben" (Life) section. ^ a b c "Ernst Haeckel" (biography), UC Berkeley , 2004, webpage: BerkeleyEdu-Haeckel . ^ Haecke…