Microsoft – Configure CMMC Level 2 Identification and Authentication (IA) controls

Identity Automation – Definitive Guide to Account Username Conventions

Open Web Application Security Project (OWASP) – Testing for Default Credentials

NIST SP 800-53: IA-2 Identification and Authentication (Organization Users)

CyberSheath- How Multi-Factor Authentication Protects Your Business

SANS Whitepaper – Two-Factor Authentication (2FA) using OpenOTP

Duo Multi-Factor Authentication

RSA SecurID Access

Thales

Symantec Whitepaper – Two-Factor Authentication