Gaya APA
al, E., Heru, T, D.
(2007).
Ujian Nasional 2008
.
Yogyakarta:
Gama Exacta.
Gaya MLA
al, Et., Heru, Thomas, Dwi.
"Ujian Nasional 2008".
Yogyakarta:
Gama Exacta,
2007.
Reference.