Concept
Version 9
Created by Boundless
Types of Internet Advertising
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"All sizes | you get 1 guess... | Flickr - Photo Sharing!."
http://www.flickr.com/photos/skampy/2490300552/sizes/o/
Flickr
CC BY-SA.