A free undergraduate textbook on quantum theory, suitable for a first course.
You can download the complete book on the arXiv at this link [coming soon]
You can also get a printed version at [coming soon]. We will not charge any royalties.
If it's more convenient, you can also print the book yourself and have it bound. Below you find some more info.

What you may do
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Download and share the PDF freely.
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Print a personal copy for yourself, or take the file to a local print shop and have it bound at cost.
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Share copies with classmates or colleagues, provided this is done without profit.
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Translate, adapt, or remix the content for teaching or research, provided your derivative is also released under CC BY-NC-SA 4.0.
What you may not do
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Sell copies of this book for profit.
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Publish a derivative version (translation, adaptation, etc.) under a more restrictive license or for commercial distribution.