Whereas chapters of the book that describe the events in separate Communist states were praised for the most part, some generalizations made by Courtois in the introduction to the book became a subject of criticism both on scholarly and political[31]: 139 grounds.[3]: 236 [32]: 13 [33]: 68–72 Moreover, three of the book's main contributors (Karel Bartosek, Jean-Louis Margolin, and Nicolas Werth)[6] publicly disassociated themselves from Stéphane Courtois' statements in the introduction and criticized his editorial conduct.[22] Margolin and Werth felt that Courtois was "obsessed" with arriving at a total of 100 million killed which resulted in "sloppy and biased scholarship",[34] faulted him for exaggerating death tolls in specific countries,[6][35]: 194 [36]: 123 and rejected the comparison between Communism and Nazism.[3][note 2]
Any good books/articles discrediting those sources?
https://en.wikipedia.org/wiki/The_Black_Book_of_Communism
https://old.reddit.com/r/GenZhou/comments/r4nehi/wiping_the_floor_with_the_black_book_of_communism/