I don't do Judo anymore and I still regularly use the masterclass series, there really good. Neal Adam's two (one on armbars one on grips) should be essential reading for any grappler. Higher Judo: Groundwork by Moshe Feledenkrais is supposed to be great, it's been sitting on my shelf for a few years I'v never finished it but I had an instructor once who used to quote it a lot.