Gaya APA
Newman, B, M., Newman, P, R. (2012).
Life-span development: a psychosocial approach (11th).
Canada:
Wadsworth Publishing.
Gaya MLA
Newman, Barbara, M., Newman, Philip, R..
"Life-span development: a psychosocial approach".
11th
Canada:
Wadsworth Publishing,
2012.
Text.