APA (7th ed.) Citation

SPSS Inc. (1990). SPSS reference guide. SPSS.

Chicago Style (17th ed.) Citation

SPSS Inc. SPSS Reference Guide. Chicago, Illinois: SPSS, 1990.

MLA (9th ed.) Citation

SPSS Inc. SPSS Reference Guide. SPSS, 1990.

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