Gaya APA
Birren, J, E., Schaie, K, W. (1990).
Handbook of the Psychology of Aging 3'rd Ed. (3).
California:
Academic Press.
Gaya MLA
Birren, James, E.., Schaie, K., Warner.
"Handbook of the Psychology of Aging 3'rd Ed.".
3
California:
Academic Press,
1990.
Text.