Google.com or Instagram.com are not valid sources.
The sources are the places where you found the images using Google or from exact posts on Instagram.
You copied an image from a certain source after using Google search to find it or by exploring specific Instagram posts.
These are the sources.
As you know that if you can't find the source that you used and there are many sources, you can simply add any source where this identical image can be found.
RE: The devastating earthquake in Syria and Turkey