Check the source's "Terms of Use," Image Credits," or "Image Permissions" section to make sure you know whether the image is under license or copyright or other terms of use.
Reverse image searching often involves finding and using the "image URL," which is the URL that describes the location of that image on a web server somewhere out there rather than the URL of any web pages that the image might be placed on.
Most browsers give you an option to see or copy the image URL if you right-click on the image. Here's what the option looks like on Chrome on a Mac.

Questions? Contact reference@carleton.edu

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