http://www.kunsthaus.ch/en/library/digital-library/picture-databases/?redirect_url=title%253DM%25D0%25A0%25E2%2580%259C%25D0%2592%25C2%25A9thodolo

Kunsthaus Zürich

Picture Databases

Image Search of Search Engines

Bing

Flickr

Google

Yahoo

Picture Archives

Deutsche Fotothek

Photography

Magnum Photos