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<a href="https://en.wikisource.org/wiki/de:Ludwig_Erk" class="extiw" title="s:de:Ludwig Erk">Ludwig Erk</a> 	Erk, Ludwig, 1807-1883, comp.</div>
books.google.com, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=">Google Books-USA</a><a href="https://en.wikisource.org/wiki/Wikisource:GBSUS" class="extiw" title="s:Wikisource:GBSUS">*</a>