He claimed to have identified 90 historical factual errors in the first 64 pages of The Rape of Nanking, some of which were corrected in the 1998 Penguin Books edition of the book.
Ia mengklaim 90 kesalahan faktual sejarah teridentifikasi dalam 64 halaman pertama dari The Rape of Nanking, beberaoa diantaranya dikoreksi dalam edisi tahun 1998 terbitan Penguin Books dari buku tersebut.