APA (7e ed.) Bronvermelding

Butler, R. N. (1977). Aging and mental health: Positive psycho-social approaches (2nd ed.). Mosby.

Chicago (17e ed.) Bronvermelding

Butler, Robert N. Aging and Mental Health: Positive Psycho-social Approaches. 2nd ed. Saint Louis: Mosby, 1977.

MLA (9e ed.) Bronvermelding

Butler, Robert N. Aging and Mental Health: Positive Psycho-social Approaches. 2nd ed. Mosby, 1977.