Here's a list of all design books that I give to new hires:

Branded Interactions: Creating the Digital Experience - (https://www.amazon.com/Branded-Interactions-Creating-Digital...)

The Visual Display of Quantitative Information - https://www.amazon.com/Visual-Display-Quantitative-Informati...

Universal Principles of Design - https://www.amazon.com/Universal-Principles-Design-Revised-U...

The Interface: IBM and the Transformation of Corporate Design, 1945-1976 - https://www.amazon.com/Interface-Transformation-Corporate-19...

Multiple Signatures: On Designers, Authors, Readers and Users - https://www.amazon.com/Multiple-Signatures-Designers-Authors...

Change by Design: How Design Thinking Transforms Organizations and Inspires Innovation - https://www.amazon.com/Change-Design-Transforms-Organization...

Thoughts on Design - https://www.amazon.com/Thoughts-Design-Paul-Rand/dp/08118754...

Notes on the Synthesis of Form - https://www.amazon.com/Notes-Synthesis-Form-Harvard-Paperbac...

..and a list of ones I'm considering adding:

Unflattening - https://www.amazon.com/gp/product/0674744438/ref=oh_aui_deta...

Creative Confidence: Unleashing the Creative Potential Within Us All - https://www.amazon.com/gp/product/038534936X/ref=oh_aui_deta...

The Design Method - https://www.amazon.com/gp/product/0321928849/ref=oh_aui_deta...

Product Design for the Web: Principles of Designing and Releasing Web Products- https://www.amazon.com/gp/product/0321929039/ref=oh_aui_deta...

Notes on the Synthesis of Form by Christipher Alexander is the most meaning-dense book I've ever read. The number and quality of his footnotes serve as proof.

http://www.amazon.com/Notes-Synthesis-Form-Harvard-Paperback...