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- Sketchpad: A man-machine graphical communication system (1963) [pdf] https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-574.pdf 26 comments
- Sketchpad: A man-machine graphical communication system [pdf] http://images.designworldonline.com.s3.amazonaws.com/CADhistory/Sketchpad_A_Man-Machine_Graphical_Communication_System_Jan63.pdf 3 comments
- Sketchpad: A man-machine graphical communication system (1963) http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.10.4290&rep=rep1&type=pdf 20 comments
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- Sketchpad: A Man-Machine Graphical Communication System https://archive.computerhistory.org/resources/access/text/2017/03/102726907-05-01-acc.pdf 3 comments historical , pdf