Quellen

Einige Bilder sind mit Genehmigung der folgenden Quellen eingebunden.


All of the sites under [ Free Stock Photos ] offers images listed under the Creative Commons Zero license, so you are free to use these images in commercial projects.

http://allthefreestock.com/


Our contents may be used freely inserting the attribution: In personal and commercial projects. In websites, presentations, printable elements and so on. Totally or partially, using the full design or modifying it as well as integrated in your own designs.

http://www.freepik.com/