The one thing I would add:
The first litmus test to ask any breeder: "Will you take this dog back at any time in its life if for any reason I cannot keep it" If the answer to this is no, or for that matter, anything other than an immediate yes, move on, no other questions need be asked.
Once you get a yes to this question, then move on to health testing, references, intentions with this breeding, etc.
I know you mention it in one line in the pdf, but I think it is important to stress that responsible breeders make sure their dogs are not the ones filling up shelters and rescues. The reason I am so passionate when I hear that someone is buying from an irresponsible breeder is that they are the ones whose dogs end up in shelters, and their new puppies take homes that could have gone to those shelter dogs.
-Nicole