Books
Game Design Workshop: A Playcentric Approach to Creating Innovative Games, Fourth Edition
https://amzn.to/3LhqRFG
Game Feel: A Game Designer’s Guide to Virtual Sensation (Morgan Kaufmann Game Design Books)
https://amzn.to/3N0lU5x
Research
Player motivations: A psychological perspective
Barbaros Bostan
https://dl.acm.org/doi/abs/10.1145/1541895.1541902
More to come!