APA (7th ed.) Citation

Norusis, M. J. (1993). SPSS for windows base system user's guide release 6.0. SPSS Inc..

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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