The market in photographs for use in books covers an enormous range - from a commissioned shot for a major celebrity book down to a 50mm-square stock thumbnail in a low-print-run textbook. Knowing the market is everything in negotiating. Talk to your fellow photographers - see the link for the NUJ members' discussion boards on this site.
The National Union of Journalists must not, can not and would not wish to dictate rates or terms of engagement to members or to editors. The information presented here is for guidance and as an aid to equitable negotiation only.
Suggestions apply to contracts governed by UK law only. In any event, nothing here should be construed as legal advice.