Gaya APA
Suardiman, S, P.
(2016).
Psikologi usia lanjut
.
Gadjah Mada University:
Gajah Mada University Press.
Gaya MLA
Suardiman, Siti, Partini.
"Psikologi usia lanjut".
Gadjah Mada University:
Gajah Mada University Press,
2016.
Text.