APA (7th ed.) Citation

Rieker, H. U. (1957). The secret of meditation. Philosophical Library.

Chicago Style (17th ed.) Citation

Rieker, Hans Ulrich. The Secret of Meditation. New York: Philosophical Library, 1957.

MLA (9th ed.) Citation

Rieker, Hans Ulrich. The Secret of Meditation. Philosophical Library, 1957.

Warning: These citations may not always be 100% accurate.