Cita APA (7a ed.)

Hill, R. D. (2008). Seven strategies for positive aging. W.W. Norton.

Cita Chicago Style (17a ed.)

Hill, Robert D. Seven Strategies for Positive Aging. New York [etc.]: W.W. Norton, 2008.

Cita MLA (9a ed.)

Hill, Robert D. Seven Strategies for Positive Aging. W.W. Norton, 2008.