The following list will help you to attribute an image or visual media source for presentations, papers, or other formats that do not require a specific publication style.
Try to include the following elements in your attribution
Examples for some of the most common instances where attribution might be nessesary.
Vincent Van Gogh, Starry Night, 1889 (oil paint on canvas). Retrieved 7.27.11: http://www.vangoghgallery.com/painting/starryindex.html
Science Library, UC Irvine by askpang, 2007 (CC BY-NC-SA 2.0)
Featherbed Alley Printshop (2006) by Aodhdubh (CC BY-SA 3.0)