Light pen (English Wikipedia)

Elliott, John C. (2020-06-08). "Monochrome Display Adapter: Notes". Seasip.info. Archived from the original on 2023-09-20. Retrieved 2016-11-23.
Elliott, John C. (2012-08-09). "Hercules Graphics Card Plus: Notes". Seasip.info. Archived from the original on 2016-11-23. Retrieved 2016-11-23.
Elliott, John C. (2012-08-05). "Hercules InColor Card: Notes". Seasip.info. Archived from the original on 2016-11-23. Retrieved 2016-11-23.

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

Roch, Axel [at Wikidata]. "2. Lightpen and Joystick". Fire-Control and Human-Computer Interaction: Towards a History of the Computer Mouse (1940–1965) (PDF). Mindell, David. Massachusetts Institute of Technology, Program in Science, Technology, and Society. pp. 2–3 [2]. Archived (PDF) from the original on 2021-06-28. Retrieved 2021-08-24. (1+10 pages) (NB. This is based on an earlier German article published in 1996 in Lab. Jahrbuch 1995/1996 für Künste und Apparate (350 pages) by Kunsthochschule für Medien Köln mit dem Verein der Freunde der Kunsthochschule für Medien Köln; Verlag der Buchhandlung Walther König [de] in Cologne, Germany. ISBN 3-88375-245-2.)
"A Critical History of Computer Graphics and Animation". Archived from the original on 2009-05-05. Retrieved 2009-05-04.
Kosmic, Raymond "Ray", ed. (2023) [2013]. "IBM 5150 - Early Versions: Early Cards - Monochrome Display and Printer Adapter (MDA)". minuszerodegrees.net. Archived from the original on 2023-12-04. Retrieved 2023-12-04.
Elliott, John C. (2020-06-08). "Monochrome Display Adapter: Notes". Seasip.info. Archived from the original on 2023-09-20. Retrieved 2016-11-23.
Elliott, John C. (2012-08-09). "Hercules Graphics Card Plus: Notes". Seasip.info. Archived from the original on 2016-11-23. Retrieved 2016-11-23.
Elliott, John C. (2012-08-05). "Hercules InColor Card: Notes". Seasip.info. Archived from the original on 2016-11-23. Retrieved 2016-11-23.
"2. Amiga joystick extensions". The Linux Kernel documentation. Archived from the original on 2022-12-12. Retrieved 2022-12-12.

wikidata.org (Global: 10^th place; English: 98^th place)

Roch, Axel [at Wikidata]. "2. Lightpen and Joystick". Fire-Control and Human-Computer Interaction: Towards a History of the Computer Mouse (1940–1965) (PDF). Mindell, David. Massachusetts Institute of Technology, Program in Science, Technology, and Society. pp. 2–3 [2]. Archived (PDF) from the original on 2021-06-28. Retrieved 2021-08-24. (1+10 pages) (NB. This is based on an earlier German article published in 1996 in Lab. Jahrbuch 1995/1996 für Künste und Apparate (350 pages) by Kunsthochschule für Medien Köln mit dem Verein der Freunde der Kunsthochschule für Medien Köln; Verlag der Buchhandlung Walther König [de] in Cologne, Germany. ISBN 3-88375-245-2.)

zkm.de (Global: low place; English: low place)

moon.zkm.de

Roch, Axel [at Wikidata]. "2. Lightpen and Joystick". Fire-Control and Human-Computer Interaction: Towards a History of the Computer Mouse (1940–1965) (PDF). Mindell, David. Massachusetts Institute of Technology, Program in Science, Technology, and Society. pp. 2–3 [2]. Archived (PDF) from the original on 2021-06-28. Retrieved 2021-08-24. (1+10 pages) (NB. This is based on an earlier German article published in 1996 in Lab. Jahrbuch 1995/1996 für Künste und Apparate (350 pages) by Kunsthochschule für Medien Köln mit dem Verein der Freunde der Kunsthochschule für Medien Köln; Verlag der Buchhandlung Walther König [de] in Cologne, Germany. ISBN 3-88375-245-2.)

Light pen (English Wikipedia)

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osu.edu (Global: 2,360^th place; English: 1,459^th place)

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wikidata.org (Global: 10^th place; English: 98^th place)