Gaya APA
Norusis, M, J. (1987).
The SPSS guide to data analysis for SPSS with additional instructions for SPSS/PC+ .
USA:
SPSS Inc.
Gaya MLA
Norusis, Marija, J..
"The SPSS guide to data analysis for SPSS with additional instructions for SPSS/PC+".
USA:
SPSS Inc,
1987.
Text.