[Teiser 1994] Teiser, Stephen F. The Scripture of the Ten Kings and the Making of Purgatory in Medieval Chinese Buddhism. Honolulu: University of Hawaii Press, 1994.
— 63-64 and n. 2
Teiser mentions that the Shimen zhengtong X1513 contains older material from such works as the Shimen zhongtong by Wu Keji 吳克己 (1142-1214). Teiser cites relevant studies n. 2.
[X] X = Xuzang jing. Shinsan dai Nippon zokuzōkyō (卍新纂大日本續藏經). Edited by Kawamura Kōshō 河村孝照; Nishi Giyū 西義雄, and Tamaki Kōshirō 玉城康四郎. Tōkyō : Kokusho Kankōkai, Shōwa 50-Heisei 1 [1975-1989]. Originally published by the Dai Nihon zoku Zōkyō. Kyōto : Zōkyō Shoin, 1905-1912. Version of the Chinese Buddhist Electronic Text Association (CBETA).