I'm newbie, more or less, with LaTeX!
I'm writing my Master Thesis, and I'm using toptesi, that is a documentation class utilized in many Italian universities. It is very useful, since it contains all settings required by University.
I have a problem with the insertion of the Bibliography:it doesn't appear in the PDF file. I'm pretty sure that the .bib file is corrected, because I separately wrote all chapter , and in each chapter I inserted the bibliography with all relative citations. When I gathered all the chapters in the thesis file, the bibliography, magically disappeared.

I tried to run in the sequence :latex file, bibtex file,latex file, latex file.
My OS is Windows. I'm using TeXworks with MiKTeX.
Thanks for the help!
Anna
P.S. Sorry for the bad English. I hope to be clear in the problem explanation.