If you use Gisgraphy, you have to specify the following attributions via a link to Gisgraphy :

Powered by Gisgraphy, OpenStreetMap

Here is the code to be included in your app, software, site or whatever.

Powered by <a href="" alt="Powered by Gisgraphy" >Gisgraphy API</a>

Other attributions

Gisgraphy uses several databases and softwares under the hood. Some services or data sources attributions have to be mentioned too