Gaya APA
IBM SPSS statistics 19 brief guide. (2010).
:
SPSS Inc.
Gaya Chicago
IBM SPSS statistics 19 brief guide.
.
:
SPSS Inc,
2010.
Electronic Resource.
Gaya MLA
IBM SPSS statistics 19 brief guide.
.
:
SPSS Inc,
2010.
Electronic Resource.
Gaya Turabian
IBM SPSS statistics 19 brief guide.
:
SPSS Inc,
2010.
Electronic Resource.