(1955). Keys to happiness: A Reader's Digest guide to successful living. The Reader's Digest Association.
Chicago-Zitierstil (17. Ausg.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
MLA-Zitierstil (9. Ausg.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.