==Riferimenti esterni== * [http://www.penhero.com/PenGallery/JohnHolland/JohnHollandJewel.htm] Un articolo sul modello [[Holland Jewel|Jewel]] * [https://web.archive.org/web/20110929201944/http://www.kamakurapens.com/John_Holland/John_Holland_Pens.html] Una biografia di John Holland * [https://web.archive.org/web/20130614070241/http://www.pensandwatches.com/_pages/pen_company_photos/holland_pen_company.htm] La pagina dell'azienda sul sito Pen and Watch * [http://web.archive.org/web/20081227221637/http://www.penbid.com/Auction/showarticle.asp?art_id=24] Un articolo con la storia dell'azienda. ==Note== <references/>