Yugoslav Royal Army and the Invasion of Yugoslavia

Does anyone have good websites who explain the April War in detail, I checked out the Wikipedia page on it and it's kinda allover the place. Also if possible a list of battles?
I'd also like to ask for photos/drawings of yugoslav soldiers from the invasion, to get to see their uniform, it's a bit hard because of all the partisan soldiers that come up when you search.
Also any footage from the war?