Most of the Usborne books from the 80s are available
on Usborne's web
site as PDFs -- "Simple BASIC" (for younger readers) or "Introduction
to Computer Programming" (for slightly older readers) might fit the
bill:
http://www.usborne.com/catalogue/feature-page/computer-and-coding-
books.aspx
Thanks for that link. That one is getting bookmarked! I can even use some of
that info ;)
-Ali