Copyright
Copyright
This textbook is under creative commons copyright CC BY-NC 
.
This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator.
It includes the following elements:
BY 
– Credit must be given to the creator
NC 
– Only noncommercial uses of the work are permitted
Selling any portion of these materials is unethical and illegal. You can share and remix/adapt this with attribution, as long as you’re not making any money off it. See “About CC Licenses” for more information.
