Gaya APA
LIEBERT, R, M., POULOS, R, W.
(1974).
Developmental psychology
.
Englewood Cliffs:
Prentice-Hall.
Gaya MLA
LIEBERT, Robert, M., POULOS, Rita, Wicks.
"Developmental psychology".
Englewood Cliffs:
Prentice-Hall,
1974.
Buku.