Marc MacYoung's new e-book --
Multiple Attackers- I'm reading it now. It MUST be an electronic purchase, and you want to read it on a tablet or PC to really be able to watch the videos that illuminate the point. He's gathered a lot of good information regarding the realities of dealing with multiple attackers, putting it into terms that you don't need to be a lawyer or martial artist to understand. And he's committed to keeping the links intact and current, and even tweaking if necessary or appropriate over time, meaning that if you keep your device/e-library synced up, it'll update itself.
https://www.amazon.com/gp/product/B08GRZBDZJ/ref=dbs_a_def_rwt_bibl_vppi_i0