There is a third: "The Making of TRON"
which was...
Something else to know:
The CineFeX magazine article from 1982 is still available,
and affordable.
http://www.cinefex.com/index/08-01.html
They gave 35 pages over to it... maybe 10,000 words.
It's photocopies, but there could be more more real information
than the coffee table book has, though I haven't seen that.
If you want color pictures be sure to get the DVD.
John A.
not affiliated to CineFeX, not even subscribed.