Cita APA (7th ed.)

Norusis, M. J. (1994). SPSS professional statistics 6.1. SPSS Inc.

Cita Chicago (17th ed.)

Norusis, Marija J. SPSS Professional Statistics 6.1. Chicago, Ill: SPSS Inc, 1994.

Cita MLA (9th ed.)

Norusis, Marija J. SPSS Professional Statistics 6.1. SPSS Inc, 1994.