This probably a bit late for this comment, but that whole tute should have had a load of reference images with it, as I was supplied with them before I made the model. Also the very first part of the tute runs thru the various references used in the tute, its easy to just do a screen grab and print the images out - or just look for references as well on google, which is what I also did before commencing on the tute.

cheers
Jay