Gaya APA
Trihendradi, C.
(2006).
SPSS 13: Step By Step Analisis Data Statistik
.
Yogyakarta:
Andi.
Gaya MLA
Trihendradi, Cornelius.
"SPSS 13: Step By Step Analisis Data Statistik".
Yogyakarta:
Andi,
2006.
Computer File.