ISA-95 and ISA-99: The Complete Technical Guide to Industrial Automation Standards
Deep ISA-95 & ISA-99 reference — Purdue model levels, B2MML, MES-ERP integration, IEC 62443 zones/conduits, and modern UNS-era adaptations.
IEC 62443 Cybersecurity for Industrial Control Systems: Zone and Conduit Architecture in Practice
Practitioner's guide to IEC 62443 — zones and conduits, security levels SL1-SL4, Purdue model alignment, and concrete reference architectures for ICS protection.