APA (7th ed.) Citation

Happold, F. C. (1970). Mysticism: A study and an anthology. Penguin Books.

Chicago Style (17th ed.) Citation

Happold, F. Crossfield. Mysticism: A Study and an Anthology. Harmondsworth: Penguin Books, 1970.

MLA (9th ed.) Citation

Happold, F. Crossfield. Mysticism: A Study and an Anthology. Penguin Books, 1970.