There is no publishing date in my Snapshot of Krakow, Warsaw and Gdansk. I knew from the book to sign up online for a tour of the Schindler Factory at www.mhk.pl/branches/oskar-schindlers-factory. What I didn't realize until I arrived in Poland in August 2015 is that they require a 3-day advance booking. You can show up, of course, and try your luck at getting into the museum. I signed up for a tour in English. When I got to the museum, I was told they do not have tours.
If you are over 60, you qualify for a discount here and at many other museums in Poland.