Textual criticism
The work's contributors refer to various sources which do not exist today. Among those sources, three Baekje documents ("Kudara-ki", etc.) are cited mainly for the purpose of recording diplomatic affairs. Textual criticism shows that scholars fleeing the destruction of the Baekje to Yamato wrote these histories and the authors of the "Nihon Shoki" heavily relied upon those sources. This must be taken into account in relation to statements referring to old historic rivalries between the ancient Korean kingdoms of Silla, Goguryeo, and Baekje.