SolarWinds – Audit policies and best practices for SEM

Internet Engineering Task Force – Network Time Protocol Best Current Practices

Carnegie Mellon University – Best Practices for NTP Services

NIST Authenticated NTP Service

Cisco – Network Time Protocol: Best Practices White Paper

Open Web Application Security Project (OWASP) – Logging Cheat Sheet OWASP

US-CERT – CRR Supplemental Resource Guide, Volume 5: Incident Management

SANS – Critical Log Review Checklist For Security Incidents

DNSstuff – 10 Best Free and Open-Source SIEM Tools

University of California Berkeley – Security Audit Logging Guideline