by Ruth, Jan-Erik, Birren, James E., Polkinghorne, Donald E.
Published in Ageing and society (01.11.1996)

by Ruth, J E, Kolehmainen, K
Published in Scandinavian journal of psychology (01.01.1974)

by Ruth, Jan-Erik, Kenyon, Gary M.
Published in Ageing and society (01.11.1996)

by Kenyon, Gary M, Ruth, Jan-Erik, Birren, James E, Öberg, Peter, Polkinghorne, Donald E, Clark, Phillip G, Hutton, Sandra
Published in Ageing and society (01.11.1996)

by Ruth, Jan-Erik
Published in Adult Education in Finland (1983)

by Tikkanen, Tarja, Ruth, Jan-Erik, Kuusinen, Jorma
Published in Aikuiskasvatus (15.05.1994)

by Ruth, Jan-Erik
Published in Aikuiskasvatus (15.02.1983)

by Ruth, Jan-Erik, Birren, James E
Published in International Journal of Behavioral Development (1985)

by Shea, Peter
Published in Ageing and society (01.03.1997)