CA/Browser Forum

• Baseline Requirements Certificate Policy for the Issuance and Management of Publicly-Trusted Certificates

Stack Overflow

• How can I generate a self-signed certificate with SubjectAltName using OpenSSL?

Microsoft

• Understanding Digital Certificates
• How to Request a Certificate With a Custom Subject Alternative Name

SSL Labs

• SSL and TLS Deployment Best Practices
• SSL Server Test

SSL Shopper

• SSL Frequently Asked Questions