• Source:

​

• Bull Terrier Standard

• Bull Terrier Club of America, Inc.

• Bull Terrier Club of America

• Bull Terrier 

• Cardiac Valvular and Vascular Disease in Bull Terrier

• Bull Terrier Monthly

• Heart Disease in Bull Terriers

• Miniature Bull Terrier

• The Bull Terrier Club

• Heart disease in the English Bull Terrier 

• Hearts

• Advanced Cardiac Database

• Barks Spring - Summer 2020