Loopknot for Treeclimber
<a href="//commons.wikimedia.org/w/index.php?title=User:Blauhaus&amp;action=edit&amp;redlink=1" class="new" title="User:Blauhaus (page does not exist)">Dirk Lingens</a>
2004
Baumknoten, <a href="//commons.wikimedia.org/wiki/Special:BookSources/3-9810417-0-4" title="Special:BookSources/3-9810417-0-4">ISBN 3-9810417-0-4</a>