Gaya APA
Gamst, G. et al (2008).
A Conceptual and Computational Approch with SPSS and SAS .
United Kingdom:
Cambrige University Press.
Gaya MLA
Gamst, Glenn. et al.
"A Conceptual and Computational Approch with SPSS and SAS".
United Kingdom:
Cambrige University Press,
2008.
Transparency.