Gaya APA
Trihendradi, C.
(2013).
Step by Step IBM SPSS 21: Analisis Data Statistik
.
Yogyakarta:
Andi Offset.
Gaya MLA
Trihendradi, Cornelius.
"Step by Step IBM SPSS 21: Analisis Data Statistik".
Yogyakarta:
Andi Offset,
2013.
.