APA (7e ed.) Bronvermelding

Heilbrun, C. G. (1998). The last gift of time: Life beyond sixty. Ballantine.

Chicago (17e ed.) Bronvermelding

Heilbrun, Carolyn G. The Last Gift of Time: Life Beyond Sixty. New York: Ballantine, 1998.

MLA (8e ed.) Bronvermelding

Heilbrun, Carolyn G. The Last Gift of Time: Life Beyond Sixty. Ballantine, 1998.