A good rule of thumb is to use the acronym TASL, which stands for:
Title: the name of the material (if provided)
Author: who owns the material?
Source: where did you find it? Provide the URL or hyperlink where the material resides
License: how can you use it? Don't just say Creative Commons. Name the CC license and provide a link to it
Here is a photo with a Creative Commons license. Following it is an example of how to attribute it.
"Creative Commons 10th Birthday Celebration San Francisco" by tvol is licensed under CC BY 2.0
This is an ideal attribution because:
Title? "Creative Commons 10th Birthday Celebration San Francisco"
Author? " tvol " - linked to his profile page
Source? Title, "Creative Commons 10th Birthday Celebration San Francisco" linked to original Flickr page
License? "CC BY 2.0" - linked to license deed
For more information on attribution go to: Creative Commons Wiki
Creative Commons provides a range of licenses, each of which grants different rights to use the materials under them.
Use the Creative Commons license chooser to help you decide which license is best for your material.