Marcellini and Sbordone are actually quite responsive to emails if you have a specific theoretical doubt. Try emailing them before you try torrenting their life's work.
But here is the secret: The book is a reference. The real work happens with pen and paper. Elementi Di Analisi Matematica 1 Marcellini Sbordone Pdf
If you find a legal digital copy via your university library, great. If not, buy the book used or borrow it. The amount of time you waste scrolling through broken PDF links is time you could spend learning the definition of a limit. Marcellini and Sbordone are actually quite responsive to
It is also expensive.
If you are a freshman engineering, physics, or mathematics student in an Italian university, three names will haunt your dreams (in a good way): Marcellini, Sbordone, and Analisi 1. great. If not