APA (7th ed.) Citation

Otto, R., & Harvey, J. W. (1959). The Idea of the Holy. Penguin Books.

Chicago Style (17th ed.) Citation

Otto, Rudolf, and John W. Harvey. The Idea of the Holy. London: Penguin Books, 1959.

MLA (9th ed.) Citation

Otto, Rudolf, and John W. Harvey. The Idea of the Holy. Penguin Books, 1959.