Dog Health Questions: Sources for a speech on the benefits of proper dog training?

I only have to site two sources, but I want them to be credible. I was thinking I would look on the internet first; however, I'm not exactly sure which sources are credible and which ones aren't.

Does anybody have credible websites they could give me for this topic? I also want sources for why dogs make such good companions for people?

Thanks!

A Long Tradition of Dog Training

Recommended Answer:
I would add the following sites:

National Association of Dog Obedience Instructors - NADOI
http://www.nadoi.org/index.htm

And my two favorite trainers:

Patricia McConnell, Ph.D.
http://www.patriciamcconnell.com/

Turid Rugaas
http://www.canis.no/rugaas/

Improve Your Training Sessions With These Dog Training Tips - Part 1

• Check out this lens on dog obedience training:
  
  http://www.squidoo.com/dog_obedience_training


• www.akc.org-- The American Kennel Club
  
  www.apdt.com-- Association of Pet Dog Trainers


• Check for Rudd Weatherwax.


• GWB?


• www.hsus.org
  
  www.apdt.com
  
  www.latham.org
  
  www.americanhumane.org
  
  www.dogstardaily.com