Nelson, Buck - My Trip to Mars, the Moon and Venus, 1956
Nikhilananda, Swami - The Gospel of Sri Ramakrishna, 1942
Omananda Puri, Swami - The Boy And The Brothers, 1959
Omananda Puri, Swami - Towards the Mysteries, 1968
Osborne (ed.), Arthur - The Collected Works of Ramana Maharshi, 1959
Osborne (ed.), Arthur - Ramana Maharshi and the Path of Self-Knowledge, 1954
Osborne, Arthur - The Incredible Sai Baba, 1957