Gaya APA
SUM, S, J.
(2006).
Awaking the excellent habit
(
Cet. 1)
.
Yogyakarta:
Gradien Books.
Gaya MLA
SUM, Sansulung, John.
"Awaking the excellent habit".
Cet. 1
Yogyakarta:
Gradien Books,
2006.
Fisip-Psikologi.