Here is a list of information you can refer to:
- Spring Security - Third Edition (https://www.packtpub.com/application-development/spring-security-third-edition) by Mick Knutson, Robert Winch, Peter Mularien
- Hands-On Spring Security 5 for Reactive Applications (https://www.packtpub.com/application-development/hands-spring-security-5-reactive-applications) by Tomcy John
- OAuth 2.0 Cookbook (https://www.packtpub.com/virtualization-and-cloud/oauth-20-cookbook) by Adolfo Eloy Nascimento