APA (7th ed.) Citation

Heiler, F. (1997). Prayer: A study in the history and psychology of religion. Oneworld Publications.

Chicago Style (17th ed.) Citation

Heiler, Friedrich. Prayer: A Study in the History and Psychology of Religion. Oxford: Oneworld Publications, 1997.

MLA (9th ed.) Citation

Heiler, Friedrich. Prayer: A Study in the History and Psychology of Religion. Oneworld Publications, 1997.

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