It looks there is a problem with TexShop and
multibib package expects that you do
bibtex xxx where
xxx is your own
newcites. However, when using TexShop it looks like it only does it for the main document. Therefore, the only way I have to make it work is to do it from command line (notice the
pdflatex main bibtex main bibtex xxx pdflatex main pdflatex main
Do you know a workaround I can do so that I can latex without problem in any IDE?