APA (7th ed.) Citation

(1994). SPSS 6.1: Base system user's guide, Part 1, Macintosh version. Marketing Department,, SPSS Inc.

Chicago Style (17th ed.) Citation

SPSS 6.1: Base System User's Guide, Part 1, Macintosh Version. Chicago, Ill: Marketing Department,, SPSS Inc, 1994.

MLA (9th ed.) Citation

SPSS 6.1: Base System User's Guide, Part 1, Macintosh Version. Marketing Department,, SPSS Inc, 1994.