Found 2 comments on HN
wolfgke · 2016-06-29 · Original thread
> I wish I could remember the name of it, it was a bright yellow cover with a superhero on it, I think.

Could it be Computer Lib/Dream Machines by Ted Nelson:

Cover of the 1974 edition: http://blogs.brandeis.edu/sarahw/files/2011/03/cover1.jpg

Front cover of the 1987 edition (in yellow): https://www.amazon.co.uk/Computer-Lib-Dream-Machines-Tempus/... (sorry, I have no image of the back cover, but I have both editions in my book shelf: Also the 1987 edition shows a superhero on its back cover (cover of Dream Machines)).

EDIT: If you want to order a reprint of the 1st edition (very difficult to get): Ted Nelson sells them again: http://hyperland.com/LibPage

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