Mickey, Stanley
Davis, 1999
Buku Teks
Golant, Stephen M.
John Wiley & Sons, 1979
Buku Teks
Koller, Marvin R
Random House, 1968
Buku Teks
Tri Budi Wahyuni Rahardjo, editor
UI-Press, 2001
UI - Pidato
International Association of Gerontology; edited by Clark Tibbitts and Wilma Donahue
Columbia University Press, 1962
Buku Teks