Gaya APA
Trihendradi, C.
(2012).
Step By Step SPSS 20 Analisis Data Statistik+ cd
.
Yogyakarta:
Andi.
Gaya MLA
Trihendradi, Cornelius.
"Step By Step SPSS 20 Analisis Data Statistik+ cd".
Yogyakarta:
Andi,
2012.
Computer File.