Attribution in a specified manner

.. or how should i mention the authors?

Two of our three licenses (GFDL & CC BY-SA) require to mention the author.

You should include the information placed at the bottom of the graphic.

Remember that you have to share your work and make clear to everybody that your work is part of a Free Culture.

How to attribute under the GPL

The GNU General Public License does not require a mentioning of the author, but you have to comply to the copyleft and make clear that the work is published under the GPL. And remember that for the future you also won't be mentioned.

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