APA (7th ed.) Citation

GRAHAM, B. (1977). The Secret of happiness. Pocket Books.

Chicago Style (17th ed.) Citation

GRAHAM, Billy. The Secret of Happiness. Pocket Books, 1977.

MLA (8th ed.) Citation

GRAHAM, Billy. The Secret of Happiness. Pocket Books, 1977.

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