[http://www.thesouthernscribe.com/pen-articles/the-famous-bock-nib-works.html], [http://www.fountainpennetwork.com/forum/index.php?/topic/20363-nib-history], [http://history.evonik.com/sites/geschichte/en/chemicals/Pages/default.aspx] | [http://www.thesouthernscribe.com/pen-articles/the-famous-bock-nib-works.html], [http://www.fountainpennetwork.com/forum/index.php?/topic/20363-nib-history], [http://history.evonik.com/sites/geschichte/en/chemicals/Pages/default.aspx] |