Gaya APA
Trihendradi, C.
(2013).
Step By Step: IBM SPSS 21: Analisis Data Statistik+cd
.
Yogyakarta:
Andi.
Gaya MLA
Trihendradi, Cornelius.
"Step By Step: IBM SPSS 21: Analisis Data Statistik+cd".
Yogyakarta:
Andi,
2013.
Computer File.