International Association of Gerontology; edited by Clark Tibbitts and Wilma Donahue
Columbia University Press, 1962
Buku Teks SO
Blackwell Publishing,
Majalah, Jurnal, Buletin
Azy Barak, editor
Cambridge University Press, 2008
Buku Teks
Ross, Alan O.
McGraw-Hill, 1976
Buku Teks
edited by, Jerzy Krupinski and Alan Stoller
Pergamon Press, 1980
Buku Teks