Public domain
Shijo Chunagon Shu: With Commentary, Sonkeikaku Zankan
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Credit line四条中納言集 : 解説共 尊経閣叢刊. 昭和17. 藤原, 定頼, 995-1045. National Diet Library, Japan. Public domain.