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<a href="https://en.wikisource.org/wiki/de:Oskar_D%C3%A4hnhardt" class="extiw" title="s:de:Oskar Dähnhardt">Oskar Dähnhardt</a></div>
books.google.com, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Jj8WAAAAYAAJ">Google Books-USA</a><a href="https://en.wikisource.org/wiki/Wikisource:GBSUS" class="extiw" title="s:Wikisource:GBSUS">*</a>