<human>: Condense the text into a few key points

I am a mechanical engineering student in my freshman year.  When ordering my books I got all of the required texts.  However, my first day of my ME class my professor told me that one of the several books he listed as optional were actually required.  I searched all of the bookstores on campus only to find that all of them were sold out and wouldn't have any more copies in for another week or so.  I have homework assigned from this book and am unable to do it because I don't have the book.  I e-mailed my professor and he basically said "tough luck."  So, basically, Reddit, I was wondering if anyone could find me a .pdf or some sort of electronic version of this book: Parametric Modeling with Autodesk Inventor 2012.
<bot>: Professor listed book as optional.  Don't have it, sold out everywhere, really need it for homework (Parametric Modeling with Autodesk Inventor 2012)