Ian Grieve has a roundup of available GP books for various version. I’ll not that he has the GP 2018 version of the Security and Audit Field Manual, but he’s missing the G 2016 version. Other than that, it looks like a pretty good list.
Microsoft Dynamics GP Book Roundup
Microsoft & the GP EcosystemGP 2018
Archived post from 2018. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.