https://www.isc2.org/certifications/References#ISSAP
https://www.isc2.org/certifications/issap/issap-self-study-resources
https://www.isc2.org/landing/issap-study-questions-ebook
-Enterprise Security Architecture: A Business-Driven Approach
-Practical Cybersecurity Architecture: A guide to creating and implementing robust designs for cybersecurity architects
-Agile Application Security: Enabling Security in a Continuous Delivery Pipeline
-Federated Identity Primer
-Identity and Access Management: Fundamentals
-Consumer Identity & Access Management: Design Fundamentals
-Solving Identity Management in Modern Applications: Demystifying OAuth 2.0, OpenID Connect, and SAML 2.0
-Practical Cloud Security: A Guide for Secure Design and Deployment
-Threat Modeling: A Practical Guide for Development Teams
-CCSP Official Study Guide
-CISSP Official Study Guide (domains 3, 4, 5, 7. If you have time, read the whole thing, I didn't because I got sick and missed 5 days of studying)