(1955). Keys to happiness: A Reader's Digest guide to successful living. The Reader's Digest Association.
Citace podle Chicago (17th ed.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
Citace podle MLA (9th ed.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..