If you cannot locate the original PDF, here is a short summary of what Schotter likely covers on or near page 65, based on the 2010 edition:

: Often includes experimental economics results to contrast theoretical models with real-world human behavior. Understanding "Pdf 65"

The student realized the 65th page of the PDF (which depends on scan settings) might not match the printed book’s page 65. So instead, they searched for:

On page 65 of Microeconomia (Italian edition), Schotter typically introduces:

Schotter dilemma del prigioniero tabella — and found identical content in a freely available lecture slide from the professor’s website.