Thank you, Arizone. Stunning pictures! I will use your Pobeda pictures in my video and will give you credit.
I agree about Chernushka's picture. It comes from the very old newspaper. I can probably use it without the written permission. If anybody knows the copyright law please advise.
I usually give credit to people who provided content in the description of my YouTube videos (in the place right below the video). But please let me know if I should do it differently.