読売新聞のメディアデータ [Yomiuri Shimbun Media Data]. The Yomiuri Shimbun (in Japanese). 2020. Archived from the original on 13 February 2021. Retrieved 11 March 2021.
読売新聞のメディアデータ [Yomiuri Shimbun Media Data]. The Yomiuri Shimbun (in Japanese). 2020. Archived from the original on 13 February 2021. Retrieved 11 March 2021.