硬筆尖 (Chinese Wikipedia)

Where's the Iridium?. The Nibster. [26 July 2016]. （原始内容存档于2016-08-01）.
Mottishaw, J. How can we talk about Iridium?. The PENnant. 1999, XIII (2) [2019-07-09]. （原始内容存档于2016-12-05）.

penheaven.co.uk (Global: low place; Chinese: low place)

Steel vs. Gold Fountain Pen Nibs. Pen Heaven. [26 July 2016]. （原始内容存档于2020-11-24）.

richardspens.com (Global: low place; Chinese: low place)

Binder, Richard. To the Point: Nib Materials. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Filling Systems: Overview of How They Work and How to Fill Them. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. To the Point: Making Music with a Pen. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Nibs I: The Basics. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Nibs II: Beyond the Basics with Specialty Nibs. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-28）.
Binder, Richard. Rethinking The Value of Steel Nibs. Richard Binder's Pens. [27 July 2016]. （原始内容存档于2021-04-26）.
Binder, Richard. To the Point: Steal the Steel. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-10-10）.

theesterbrookproject.com (Global: low place; Chinese: low place)

Esterbrook # 312 Judge's Quill. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-10-03）.
Esterbrook # 313 Probate Pen. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-02-24）.
Esterbrook #339z 律师笔. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-10-03）.

theparisreview.org (Global: 3,741^st place; Chinese: low place)

Piepenbring, Dan. Tools of the Trade. The Paris Review. November 17, 2014 [2019-07-09]. （原始内容存档于2021-04-27）.

thesteelpen.com (Global: low place; Chinese: low place)

笔的历史：最原始的笔和钢笔. The Steel Pen. （原始内容存档于2020-11-28）.
早期金属笔的其他证据. The Steel Pen: Writing, History and the History of How we Write. （原始内容存档于2021-02-26）.
Peregrine Williamson: Inventor, Businessman, and Pioneer Pen Maker. The Steel Pen. （原始内容存档于2021-01-25）.
笔的历史: 早年 – 1820年代. The Steel Pen. （原始内容存档于2021-04-27）.
笔的历史: 早年 – 1830年代. The Steel Pen. （原始内容存档于2021-01-18）.
存档副本. [2019-07-09]. （原始内容存档于2018-07-11）.

vintagepen.net (Global: low place; Chinese: low place)

Grading Flex Nibs. VintagePen. [26 July 2016]. （原始内容存档于2021-04-27）.

web.archive.org (Global: 1^st place; Chinese: 1^st place)

羽毛笔（页面存档备份，存于互联网档案馆）的起源
"历史 101: 钢笔和墨水" （页面存档备份，存于互联网档案馆）, Daily Kos，2013.11.16
笔的历史：最原始的笔和钢笔. The Steel Pen. （原始内容存档于2020-11-28）.
早期金属笔的其他证据. The Steel Pen: Writing, History and the History of How we Write. （原始内容存档于2021-02-26）.
Peregrine Williamson: Inventor, Businessman, and Pioneer Pen Maker. The Steel Pen. （原始内容存档于2021-01-25）.
1809年为Wise和Willianmson制作的钢笔广告. 1809. （原始内容存档于2019-06-07）.
笔的历史: 早年 – 1820年代. The Steel Pen. （原始内容存档于2021-04-27）.
笔的历史: 早年 – 1830年代. The Steel Pen. （原始内容存档于2021-01-18）.
存档副本. [2019-07-09]. （原始内容存档于2018-07-11）.
Esterbrook # 312 Judge's Quill. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-10-03）.
Esterbrook # 313 Probate Pen. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-02-24）.
Esterbrook #339z 律师笔. The Esterbrook Project. [2019-07-09]. （原始内容存档于2020-10-03）.
Piepenbring, Dan. Tools of the Trade. The Paris Review. November 17, 2014 [2019-07-09]. （原始内容存档于2021-04-27）.
Mathur, P.; Mathur, K.; Mathur, S. Developments and Changes in Science Based Technologies. : 128 [2019-07-09]. ISBN 1-4828-1398-X. （原始内容存档于2020-08-01）.
Binder, Richard. To the Point: Nib Materials. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Steel vs. Gold Fountain Pen Nibs. Pen Heaven. [26 July 2016]. （原始内容存档于2020-11-24）.
Where's the Iridium?. The Nibster. [26 July 2016]. （原始内容存档于2016-08-01）.
Mottishaw, J. How can we talk about Iridium?. The PENnant. 1999, XIII (2) [2019-07-09]. （原始内容存档于2016-12-05）.
Binder, Richard. Filling Systems: Overview of How They Work and How to Fill Them. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
How Fountain Pens Work. Explain That Stuff. [27 July 2016]. （原始内容存档于2021-04-25）.
Binder, Richard. To the Point: Making Music with a Pen. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Nibs I: The Basics. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Nibs II: Beyond the Basics with Specialty Nibs. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-04-28）.
Grading Flex Nibs. VintagePen. [26 July 2016]. （原始内容存档于2021-04-27）.
Binder, Richard. Rethinking The Value of Steel Nibs. Richard Binder's Pens. [27 July 2016]. （原始内容存档于2021-04-26）.
Fountain Pen Guide. Gentleman's Gazette. [27 July 2016]. （原始内容存档于2020-11-12）.
Binder, Richard. To the Point: Steal the Steel. Richard Binder's Pens. [26 July 2016]. （原始内容存档于2021-10-10）.
How to Collect and Buy Vintage Fountain Pens. The Art of Manliness. 19 November 2015 [27 July 2016]. （原始内容存档于2018-03-12）.

硬筆尖 (Chinese Wikipedia)

about.com (Global: 216th place; Chinese: 361st place)

inventors.about.com

archive.today (Global: 14th place; Chinese: 18th place)

artofmanliness.com (Global: low place; Chinese: low place)

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dailykos.com (Global: 5,214th place; Chinese: low place)

explainthatstuff.com (Global: low place; Chinese: low place)

gentlemansgazette.com (Global: low place; Chinese: low place)

history.org (Global: low place; Chinese: low place)

newspapers.com (Global: 55th place; Chinese: 1,009th place)

nibs.com (Global: low place; Chinese: low place)

penheaven.co.uk (Global: low place; Chinese: low place)

richardspens.com (Global: low place; Chinese: low place)

theesterbrookproject.com (Global: low place; Chinese: low place)

theparisreview.org (Global: 3,741st place; Chinese: low place)

thesteelpen.com (Global: low place; Chinese: low place)

vintagepen.net (Global: low place; Chinese: low place)

web.archive.org (Global: 1st place; Chinese: 1st place)

about.com (Global: 216^th place; Chinese: 361^st place)

archive.today (Global: 14^th place; Chinese: 18^th place)

books.google.com (Global: 3^rd place; Chinese: 8^th place)

dailykos.com (Global: 5,214^th place; Chinese: low place)

newspapers.com (Global: 55^th place; Chinese: 1,009^th place)

theparisreview.org (Global: 3,741^st place; Chinese: low place)

web.archive.org (Global: 1^st place; Chinese: 1^st place)