Microsoft – Architecture Strategies for Securing a Development Lifecycle

NIST – Secure Software Development Framework

Cloudflare – What is defense in depth? | Layered security

OWASP – Secure Coding Practices

Amazon Web Services – Operational Best Practices for CMMC 2.0 Level 2

NIST SP 800-160 Vol. 1 Rev. 1: Engineering Trustworthy Secure Systems

NIST SP 800-160 Vol. 2 Rev. 1: Developing Cyber-Resilient Systems: A Systems Security Engineering Approach

CMMC Level 2 Assessment Guide

Carnegie Mellon University – Top 10 Secure Coding Practices

US-CERT – Recommended Practice: Improving Industrial Control System Cybersecurity with Defense-in-Depth Strategies