One of the characteristics of this book is that it contains many quotations from other books ---although most of the quoted books don't exist now--- and some articles whose sources are unknown seem to have been based on the diaries and records in those days.
多くの典籍を引用していることは本書の特徴の一つであるが、その大半が今日伝存せず、出典の明らかでない記事も当時の日記・記録によったと思われる。