APA (7e ed.) Bronvermelding

Norusis, M. J. (1993). SPSS for Windows: Base system user's guide, release 6.0. SPSS Inc.

Chicago (17e ed.) Bronvermelding

Norusis, Marija J. SPSS for Windows: Base System User's Guide, Release 6.0. Chicago, Illinois: SPSS Inc, 1993.

MLA (9e ed.) Bronvermelding

Norusis, Marija J. SPSS for Windows: Base System User's Guide, Release 6.0. SPSS Inc, 1993.