"Fondamenti di Fisica" is a comprehensive textbook on physics, widely used in Italian-speaking universities. The book covers the fundamental concepts of physics, from mechanics to thermodynamics, electromagnetism, and wave physics. The authors, David Halliday, Robert Resnick, and Jearl Walker, are renowned experts in the field.
As for the PDF version, I couldn't find a direct link to a free PDF copy of the book. However, I can suggest some possible sources: halliday fondamenti di fisica pdf