API & Interaction Design

• The Design of Everyday Things by Don Norman (2013) — Affordances, signifiers, mental models. Applies to APIs and UIs alike. (copyrighted)
• RESTful Web APIs by Richardson & Amundsen (2013) — Hypermedia, representations, profiles. REST done properly. (copyrighted)
• API Design Patterns by JJ Geewax (2021) — Practical patterns for designing internal and public APIs. (copyrighted)