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Clarke, Peter B. (ed.) (1999), 'Kofuku-no-Kagaku: The Institute for Research in Human Happiness' in  A Bibliography of Japanese New Religious Movements: With Annotations , Surrey, UK, Japan library (Curzon), ISBN 1-873410-80-8, pp. 149-67

Yamashita, Akiko (1998), 'The "Eschatology" of Japanese new and new new religions: from Tenrikyo to Kofuku-no-Kagaku' in  Japanese Religions , Vol. 23, January 1998, NCC, Kyoto, Japan, pp. 125-42

"The Transformation of a Recent Japanese New Religion: Okawa Ryuho and Kofuku no Kagaku" in  Japanese Journal of Religious Studies  22, pp. 343-380