They come from Oda/Oda related works... If you want from the manga... Here:
If you want more here's more:
If you want haki that's not
hardening armament Haki (the concentrated arm haki), where Oda doesn't shade it black:
You don't need to be shown them using haki to confirm whether their using haki or not, Akainu got
annoyed of them trying to use haki on him and
it didn't work for a reason... A reason that's been stated and shown multiple times for post timeskip
The problem is you not understanding one piece...
You need the fanbooks, I don't or didn't. The sources I gave before are from the op magazines where it went over
the basics of one piece for
beginners, it seems even with that, you still aren't understanding...
At this point you aren't even willing to understand it seems, so until you aren't close minded, It's a waste of time to discuss with you