APA (7th ed.) Citation

(1955). Keys to happiness: : a reader ́s digest guide to successful living. The reader ́s Digest Association.

Chicago Style (17th ed.) Citation

Keys to Happiness: : A Reader ́s Digest Guide to Successful Living. Pleasantville (N.Y.): The reader ́s Digest Association, 1955.

MLA (9th ed.) Citation

Keys to Happiness: : A Reader ́s Digest Guide to Successful Living. The reader ́s Digest Association, 1955.