Παραπομπή APA

Weale, R. A. (2010). Youth prolonged old age postponed.

Παραπομπή Chicago Style

Weale, Robert; Author. Youth Prolonged Old Age Postponed. London, Imperial College Press, 2010.

Παραπομπή MLA

Weale, Robert; Author. Youth Prolonged Old Age Postponed. 2010.