For numbers stuff, the original Getty et al. analysis of NKVD archives on the purges is good. It's available here. There's also a Jacobin article that is an alright retrospective on him. There's also a new book out on the Kazakh famine (which has been criminally understudied in general), available here.
There's also this Askhistorians answer which is pretty good, however one thing is that a lot if it is informal sort of all soviet historians know this but don't write it down always kind of thing since the initial publications debunking him came out. Most social and cultural school books if they were written during the period when Conquest was still active will debunk him in an introduction to a chapter or snarkily do it in footnotes.
For numbers stuff, the original Getty et al. analysis of NKVD archives on the purges is good. It's available here. There's also a Jacobin article that is an alright retrospective on him. There's also a new book out on the Kazakh famine (which has been criminally understudied in general), available here.
There's also this Askhistorians answer which is pretty good, however one thing is that a lot if it is informal sort of all soviet historians know this but don't write it down always kind of thing since the initial publications debunking him came out. Most social and cultural school books if they were written during the period when Conquest was still active will debunk him in an introduction to a chapter or snarkily do it in footnotes.