Licensing materials
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To license code under the GNU General Public License, you will need to include the full text of those licenses with your work; see How to use the GPL.
Attribution
You will be attributed as the creator or publisher of these works wherever they are used.
If you would like to be attributed in a particular way - with connection to a logo, originating website, or source repository, please include those materials and links along with the work. Please also include information about any authors and organizations who have been involved with the creation of a work who should receive similar recognition.
Compatibility and other licenses
The GPL is the most widely-used license for free software, and is a copyleft license. The MIT license is compatible with the GPL and most other licenses, and is not copyleft, meaning it does not impose most of the restrictions the GPL does on reuse.
The CC-BY license is compatible with most online collections and archives of texts and media, particularly Connexions and Wikimedia Commons. The equivalent copyleft license is CC-BY-SA [also called CC-SA].
To use other licenses, print and link similarly to their texts: