TrendMicro – Firewall Rule Actions and Priorities

Cisco – CLI Book 2: Cisco ASA Series Firewall CLI Configuration Guide, 9.4

Security Boulevard – Endpoint and network segmentation best practices

Nano Dimension – Best Practices for Network Segmentation

Information Security Program – Network Security Best Practices and Checklist

LiveAction – 5 Network Monitoring Best Practices You Need to Know

Microsoft – Firewalls

SANS Institute – Firewall Checklist