…ty of Cambridge" . 6 July 2015. 1 2 3 4 5 6 7 "Ernst Haeckel" (article), German Wikipedia , 26 October 2006, webpage: DE-Wiki-Ernst-Haeckel : last paragraph of "Leben" (Life) section. [ butuh sumber yang lebih baik ] ↑ Felden, Emil [in Jerman] (1914). "Felden Pastor an St. Martin…

…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…

… 10.1093/gmo/9781561592630.article.19943 . ISBN 978-1561592630 . (subscription, Wikilibrary access, or UK public library membership required) ^ "Who knew? Friedrich Nietzsche was also a pretty decent classical composer" . Classic FM . ^ Kohler, Joachim (1998). Nietzsche & Wagner:…