A collection is a compilation of works in which each of the materials is still distinctly separate, e.g. a reader with several articles.
Take note of the following when you include CC licensed material in a collection:
Attribute
Provide attribution for all shared materials, including their license. Check section 'How to attribute' for information on providing attribution.
NonCommercial (NC) licenses
Only include NonCommercial (NC) licensed works in collections you don't share commercially.
Copyrighted works without a CC license
If including copyrighted works, make sure sharing is allowed. E.g. make use of citation rights.
You may CC license the collection
This license applies only to your creative additions. E.g. a foreword, layout, the way you've compiled it.
The works you've compiled regain their own licenses, which you must show clearly.
If it contains copyrighted works without a CC license, make clear these works are ‘all rights reserved’.
The segment 'Licensing your work' addresses how to choose a license.