Below is a listing of helpful links and resources, documents and websites related to industrial cybersecurity.
ISA Cybersecurity Resources
https://www.isa.org/technical-topics/cybersecurity/cybersecurity-resources/
NIST Cybersecurity Framework
https://www.nist.gov/cyberframework
Cybersecurity & Infrastructure Security Agency (CISA)
Infragard
National Cyber Security Alliance
https://www.industrialcybersecuritypulse.com/wp-admin/post.php?post=651&action=edit
Information Systems Security Association
SANS institute
Center for Internet Security
Internet Security Alliance
Information Security Research Association