INTERRA recommends to read these articles:
A Practical Guide to Judging Irish Terriers, by Bruce L. Petersen - http://itca.info/wp-content/uploads/A-Practical-Guide-to-Judging-Irish-Terriers.pdf @Irish Terrier Club of America
About the Stafforshire Bull Terrier:
Article on Border Terriers: https://yourdogadvisor.com/border-terrier/
If you are looking for a Terrier puppy, please search for your country's Terrier Club that will recomend you BREEDERS, and not Puppy Mills. Protect yourself, and protect the dogs. Only credited breeders can assure that you will get a Terrier fit to function, acording to the standard, with correct temperament and good health.