APA (7th ed.) Citation

SPSS Inc. (2003). SPSS base 12.0 user's guide. SPSS Inc..

Chicago Style (17th ed.) Citation

SPSS Inc. SPSS Base 12.0 User's Guide. Chicago, Ill.: SPSS Inc., 2003.

MLA (9th ed.) Citation

SPSS Inc. SPSS Base 12.0 User's Guide. SPSS Inc., 2003.

Warning: These citations may not always be 100% accurate.