Hey MrBean,
One of the first references I would recommend is the courses that National Instruments offers. The courses actually include a manual. I believe in the past you've mentioned that you already took the TestStand class so you might already have these. I would also check out our
website here for books. Although from some of the titles, some of these books may be a little outdated. Hope this helps!
Pat P.
Software Engineer
National Instruments