Forest technology students often need images for reports, presentations, and web pages. Sometimes it’s hard to find a picture that you can legally use due to copyright issues. One great source of images is Forestry Images. It seems to be housed at the University of Georgia. Most images can be downloaded in a variety of sizes. For the larger sized you need to sign up for a free membership.
Then all you need to do is cite the image according to the recommendations on the page. For example, this black walnut image:
Richard Webb, Self-employed horticulurist, Bugwood.org