(1955). Keys to happiness: A Reader's Digest guide to successful living. The Reader's Digest Association.
Cita Chicago Style (17a ed.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
Cita MLA (9a ed.)Keys to Happiness: A Reader's Digest Guide to Successful Living. The Reader's Digest Association, 1955.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.