Katō, Bunnō; Tamura, Yoshirō; Miyasaka, Kōjirō (1993). The Threefold Lotus Sutra: The Sutra of Innumerable Meanings, The Sutra of the Lotus Flower of the Wonderful Law, The Sutra of Meditation on the Bodhisattva Universal Virtue. Tōkyō: Kōsei Publishing Company. ISBN4-333-00208-7. Archived from the original