Authors do get royalties on international sales -- but they are usually
less than  on domestic sales.  My experience is that the usual royalty
rate for textbooks on domestic sales is 14% of the wholesale price;  on
international sales, it is 10%.
           When I taught in Syracuse's Study Abroad Program in Florence
last semester,  I used the same textbooks  (Schaeffer et al.'s Int. Bus.
Law was one of them) that I use here in Syracuse -- but  the copies
available to my students were the paperback international versions --
rather than the hardback versions available to them in the U.S.  As with
Robert's experience, in all other respects, the books were the same --
but they did cost quite a bit less than the hardback versions in the
U.S.
                                                                  Ciao,
                                                                   Pat
Cihon