APA (7e ed.) Bronvermelding
Achenbaum, W. A. (2013). Robert N. Butler, MD: Visionary of healthy aging. Columbia University Press.
Chicago (17e ed.) Bronvermelding
Achenbaum, W. Andrew. Robert N. Butler, MD: Visionary of Healthy Aging. New York: Columbia University Press, 2013.
MLA (9e ed.) Bronvermelding
Achenbaum, W. Andrew. Robert N. Butler, MD: Visionary of Healthy Aging. Columbia University Press, 2013.
Let op: Deze citaties zijn niet altijd 100% accuraat.