Gaya APA

Krikpatrick, L, A., Feeney, B, C. (2012). A Simple Guide to IBM SPSS Statistic for Versions 18.0 & 19.0 . USA: Wadsworth Cengage Learning.

Gaya MLA

Krikpatrick, Lee, A.., Feeney, Brooke, C.. "A Simple Guide to IBM SPSS Statistic for Versions 18.0 & 19.0". USA: Wadsworth Cengage Learning, 2012. Text.