I'm getting such questions for 35+ years - and never discussing any of my sources (not in the…

At most, one can find them listed - and 'nicely coded' - in books of this kind:

I'm getting such questions for 35+ years - and never discussing any of my sources (not in the public and not in private).

At most, one can find them listed - and 'nicely coded' - in books of this kind:

https://www.helion.co.uk/military-history-books/moscows-game-of-poker-russian-military-intervention-in-syria-2015-2017.php?sid=ebaedd337a6be0dc6a45ae2760a115a8