Copyrighted Images (PLEASE READ)

[True Federalist (진정한 연방 주의자)]

Incidentally, for a picture on the WIkimedia Commons, if you click on the "Use this file on the web" link, you'll be able to get some BBCode you can simply copy and paste, like so:

John Bel Edwards Richard David Ramsey [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

TRUMAN 58-766-06 National Archives and Records Administration. Office of Presidential Libraries. Harry S. Truman Library. [Public domain], via Wikimedia Commons

It's attribution is a bit more verbose than Kal's minimum standard, but it'll certainly do and requires very little effort since you only need to copy and paste,