Some reliable resource recommendations:

• California Department of Food and Agriculture | Avian Health Program

• Association of Avian Veterinarians | Bird Owner Resources
• Centers for Disease Control And Prevention | Backyard Poultry | Healthy Pets, Healthy People
• Healthy Farms Healthy Agriculture | Biosecurity Best Practices
• National Poultry Improvement Plan | Poultry Disease Information
• The Animal Disease Biosecurity Coordinated Agricultural Project | Outreach Publications
• United States Department of Agriculture | Defend the Flock Resource Center