The same principles apply to providing attribution across all CC licences. These are the things to include in your attribution:
• credit the creator;
• provide the title of the work;
• provide the URL where the work is hosted;
• indicate the type of licence it is available under and provide a link to the licence (so others can find out the licence terms); and
• keep intact any copyright notice associated with the work.
(taken from the "Attributing Creative Commons work" document below)
The links below give sample references - you may need to adapt the format for your referencing style:
Austin, S. (2007). New Zealand Christmas tree - Pohutukawa. Licensed under Creative Commons Attribution-NonCommercial 2.0 Generic. Retrieved from http://www.flickr.com/photos/sondyaustin/2120390720/
This is an example of how to attribute when you are working offline (eg: in print or powerpoint). As you cannot provide hyperlinks between content, you need to provide more detailed information.
You can either name the CC Licence or download the CC licence button.