APA (7th ed.) Citation

Happold, F. C. (1966). Religious faith and twentieth-century man. Penguin Books.

Chicago Style (17th ed.) Citation

Happold, F. C. Religious Faith and Twentieth-century Man. [Middlesex] [etc.]: Penguin Books, 1966.

MLA (9th ed.) Citation

Happold, F. C. Religious Faith and Twentieth-century Man. Penguin Books, 1966.

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