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O'Hanlon, Daniel J. 1978. "Zen and the Spiritual Exercises: A Dialogue Between Faiths". Theological Studies 39: 737-768.
Okumura, Shohaku. 1985. Shikantaza. An Introduction to Zazen. Kyoto: Kyoto Sôtô Zen Center.
____________1987. Shôbôgenzô Zuimonki: Sayings of Eihei Dôgen Zenji. Kyoto: Kyoto Sôtô Zen Center.
____________1988. Dôgen Zen. Kyoto: Kyoto Sôtô Zen Center.
Olson, Carl. 1981. "The Leap of Thinking". Philosophy Today 25: 55-62.
____________1983. "Beatings, Shouts, and Finger Raising: A Study in Zen Language". Journal of Religious Studies 10,2: 45-50.
____________1986. "The Human Body as a Boundary Symbol; A Comparison of Merleau-Ponty and Dôgen". Philosophy East and West 36,2: 107-120.
____________1988. "The Zen Clown Ikkyû: A Cross-cultural Study of a Symbol of Disorder". Journal of Dharma 13: 147-163.
____________1989. "The Existential Doubt of Tillich and the Great Doubt of Hakuin". Buddhist-Christian Studies 9: 5-12.
O'Malia, Edwin F. 1979. The Transformation of Man: A Descriptive Study in the Thought of Sri Aurobindo (Gose) and Zen Buddhism as Explicated in the English Language Writings of Daisetz Teitaro SuzukiPh.D. diss., Temple University.
Ômori, Sôgen. 1982. "Zen Sword: Comments on the Fudôchi shimmyôroku of Zen Master Takuan" (trans. by Sonja Arntzen). Chanoyu Quarterly 30: 53-67.
Ômori, Sôgen, and Terayama, Katsuji. 1983. Zen and the Art of Calligraphy (trans. by John Stevens). London: Routledge & Kegan Paul.
Ooms, Hermann. 1986. "'Primeval Chaos,' and 'Mental Void' in Early Tokugawa Ideology: Fujiwara Seika, Suzuki Shôsan, and Yamazaki Ansai.". Japanese Journal of Religious Studies 13,4: 245-260.
Otsu, Daizokutsu R. 1989. The Bull and its Herdsman. A Zen Story from Ancient China (tr. by Irmgard Schloegl). London: Zen Centre.