Wanna Work Together by the Creative Commons Organization and licensed under a Creative Commons Attribution (CC BY) license
The term “open content” describes any copyrightable work (traditionally excluding software, which is described by other terms like “open source”) that is licensed in a manner that provides users with free and perpetual permission to engage in the 5R activities:
License Text and Icons by Creative Commons Organization and is licensed under a Creative Commons Attribution 4.0 License.
https://creativecommons.org/choose/ walks you through the process of choosing a license with the features you want. It also lets you enter metadata that will help others provide attribution to you when they reuse your work.
At the end of the process you have an image and text that you can copy/paste, as well as machine-readable code that you can add to a website.
How to Build an Attribution - Use the Attribution Builder
http://www.openwa.org/open-attrib-builder/
prompts you to enter the information needed for a well-written attribution.
After you enter the information, this tool generates an attribution that you can copy/paste, as well as html code that you can add to a website.