What book can you read on the basics of designing CRM systems?

Question

CRM

Good afternoon!
Please tell me what literature can be read on the basics of designing CRM systems?
In particular, I would like to understand what architectural features are used in this case,
what design patterns.

Answer 1

1. You can read the user documentation for existing common CRM systems.
2. You can study in practice how these systems work by installing some kind of open source system.
3. You can read simply on the CRM system to understand the subject area.
3. The architectural features of CRM systems differ little from the architectural aspects of other business applications, so you can just read a book on system architecture.

Answer 2

the book from 1C is basically informative)