The book is basically based on No. 1 to No. 3 mentioned above, but it partly referred to No. 4, diaries of court nobles in Kyo represented by FUJIWARA no Teika's "Meigetsuki," and accounts of incidents occurred in Kyo were sometimes copied word for word into the book.
基本的には上記の1.から3.がベースとなるが、部分的には4.の京の貴族の日記、代表的には藤原定家の『明月記』などから、京での事件などか丸写しされたりもしている。