These are a few of my favourites. This list will evolve as I discover new literature on this emerging field.

Design Thinking

The Design of Everyday Things: Revised and Expanded Edition
By Donald A. Norman

The Sciences of the Artificial, Third Edition
By Herbert A. Simon

Experience Design

The new digital storytelling: creating narratives with new media
By Bryan Alexander

Experience design: A framework for integrating brand, experience, and value
By Patrick Newbery, Kevin Farnham

The UX Book: Process and Guidelines for Ensuring a Quality User Experienceby By Rex Hartson, Pardha S. Pyla

Experience Design: Technology for All the Right Reasons
By Marc Hassenzahl

User Story Mapping: Discover the Whole Story, Build the Right Product
By Jeff Patton, Peter Economy

Storytelling for user experience: Crafting stories for better design
By Kevin Brooks and Whitney Quesenbery

This is Service Design Thinking: Basics, Tools, Cases
By Marc Stickdorn, Jakob Schneider

Design Research

Ethnography: Principles in Practice
By Martyn Hammersley, Paul Atkinson

Design Kit: The Field Guide to Human-Centered Design
By Ideo

Observing the User Experience: A Practitioner’s Guide to User Research
By Mike Kuniavsky

Behaviour Change

Preference Change: Approaches from philosophy, economics and psychology
Edited by Till Grüne-Yanoff, Sven Ove Hansson

Nudge: Improving Decisions about Health, Wealth, and Happiness
By Richard H. Thaler, Cass R. Sunstein

Interaction Design

Multiple user interfaces: Cross Platform applications and context-aware interfaces
Edited by Ahmed Seffah, Homa Javahery

The best interface is no interface: The simple path to brilliant technology
By Golden Krishna

Smart Things: Ubiquitous Computing User Experience Design
By Mike Kuniavsky

Technology as Experience
By John McCarthy, Peter Wright

Calm Technology: Principles and Patterns for Non-Intrusive Design
By Amber Case